Author Topic: The Mazda 3 Fuel Economy Thread  (Read 369117 times)

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Offline StevenRB45

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Re: The Mazda 3 Fuel Economy Thread
« Reply #825 on: July 10, 2019, 11:24:03 AM »


New PB...not bad given again I'm not hypermiling. So achieved 3 up with a boot full of crap travelling at NSL+. Also climate control and a/c on whole time.

Trip computer only said 44.4mpg oddly but it gets pessimistic if you get stuck in traffic a bit i find.

Tbf I could have cheated on this one and filled up mid week so there would have been no round the the doors in involved at which point I suspect it would have been nudging 47-48 but given the official figure is 43 for this car I'll take that.
« Last Edit: July 10, 2019, 11:32:33 AM by StevenRB45 »

Offline Engineer Andy

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Re: The Mazda 3 Fuel Economy Thread
« Reply #826 on: August 01, 2019, 01:30:47 PM »
I'm recently back from holiday in the West Country and my gen-1 1.6 petrol (just me in it, but laden with suitcase, full rucksack, provisions [self-catering holiday] and golf bag and trolley [full boot]) managed to achieve around the 44mpg mark on Ron95.  Not bad for a 13yo car (essentially the same as 10 years+ ago), including mooching around Cornwall on many country lanes as well as the mainly motorway/dual carriageway (at 70mph most of the time) journey there and back, with the A/C on throughout. Still averaging about 40.5mpg over the long term, similar to StevenRB45's car.  Just shows how decent an engine it is in the long term, especially when well looked after.

Unlike many of the latest cars on sale today, those from the late 90s and up to around/just after 2010 often seem to exceed their expected (official) mpg, even in mixed driving.

Offline andyl

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Re: The Mazda 3 Fuel Economy Thread
« Reply #827 on: September 03, 2019, 08:27:55 AM »
Recently saw on the ( slightly optimistic ) fuel computer 59.9 mpg running on A roads and a bit of urban.

I have had it in the past when an older diesel engine gets more economical. My wife's 2004 Honda Accord had almost 140K on the clock after 3 years and on a 70mph motorway cruise was returning 64 mpg!

Offline GTC

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Re: The Mazda 3 Fuel Economy Thread
« Reply #828 on: March 03, 2020, 07:39:56 PM »
2015 2.0 petrol, 44mpg calculated from brim to brim mileage. about 40% town/60% A roads. very pleased with this!

Offline red_imps_2003

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Re: The Mazda 3 Fuel Economy Thread
« Reply #829 on: March 09, 2020, 05:40:58 PM »
That's really decent! My smaller diesel engine doesn't manage much more (currently 52.5) to warrant the additional purchase/maintenance costs and the generally slightly higher price of fuel.  :(
So I was stood there trying to work out why the cricket ball was getting larger and larger...and then it hit me.

Offline Engineer Andy

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Re: The Mazda 3 Fuel Economy Thread
« Reply #830 on: March 09, 2020, 05:54:16 PM »
Bear in mind red_imps that your car is over 10 years old and GTCs is half that age with a new engine design - their figure is in-keeping with the 'Real MPG' reported by owners on Honest John's website.  Still, it does show how far the car has come over the years, although (as I found out when test-driving one) the normal performance (i.e. not flooring it) of the car is not that much better than the gen-1's 1.6 petrol engine, as Mazda have tuned it more for efficiency for everyday driving than performance.

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Re: The Mazda 3 Fuel Economy Thread
« Reply #831 on: June 24, 2020, 09:54:14 AM »
Put in some diesel treatment fluid, headed down the motorway and mainly dual carriage ways and the computer was showing 65 mpg!

Offline pillred

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Re: The Mazda 3 Fuel Economy Thread
« Reply #832 on: May 01, 2021, 11:15:59 AM »
Bought my e-skyactiv x last week took a run down to Lyme Regis, two of us full luggage 30 miles on the clock arrived at site average fuel consumption 65.6mpg, drove around for 3 days lots of short journeys then drove back to Bristol overall after 160 miles 56.7mpg, so they really have cracked the diesel economy petrol smoothness holy grail should be even better when it's done a few thousand miles very pleased looks like you can believe the hype.

Offline Engineer Andy

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Re: The Mazda 3 Fuel Economy Thread
« Reply #833 on: May 05, 2021, 07:19:53 PM »
Bought my e-skyactiv x last week took a run down to Lyme Regis, two of us full luggage 30 miles on the clock arrived at site average fuel consumption 65.6mpg, drove around for 3 days lots of short journeys then drove back to Bristol overall after 160 miles 56.7mpg, so they really have cracked the diesel economy petrol smoothness holy grail should be even better when it's done a few thousand miles very pleased looks like you can believe the hype.

Good to hear, but a word of caution - if those figures are gleened from the trip computer, they aren't as accurate as the 'brim-to-brim' mpg calculation method often referred to here and elsewhere.  It's the reason why the 'low fuel' warning light often goes on too early, because the car's fuel flow 'sensor' likely overreads (as they do for all ICE engined vehicles, to be on the safe side).  Mine certainly does.

Unfortunately, the latest gen Mazdas don't yet feature on the Honest John website's 'Real MPG' page yet (the page may not be updated anymore, or at least lapsed due to staffing reductions after the site takeover/pandemic), so it would be good for you and other gen-4 SA-X Mazda3 owners to keep a record of your cars' overall mpg, etc to see how things pan out.  TBH, I'm just as interested in the performance side of things, given in the UK Mazda appear to want to use this engine instead of the 2.5 SA-G in the sportier Mazda3s.

Offline Aidan

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Re: The Mazda 3 Fuel Economy Thread
« Reply #834 on: May 12, 2021, 07:13:28 PM »
Over its lifetime with me, My 2013 1.6 Gen 2 Tamura averaged about 37mpg. I think the best ever figures I achieved were on a weeks holiday in Scotland with 2 long motorway trips and then cruising around at 60mph max, when I averaged around 44 mpg. I was still getting the same sort of figures at 75000 miles as I did at 10000, so although the normal figures are not outstanding the engine was still performing well.  My new skyactiv G 2.0 model now has 3500 on the clock and is returning figures of +/-  40mpg on my normal (13 miles each way) commute & usage, calculated brim to brim. ( the computer says 41.3 at present including weekend short distance trips).

 A question:  I'm getting over 400 miles out of the 51 litre tank on the new car - I filled it to the brim when it read 2 miles range & got 47 litres in.
( I know that doesn't mean there were 4 litres left in the tank as I had filled the tank plus the filler pipe).  Has anyone driven "into the red" and how close to empty are you really, when the computer says  zero miles?.

( Using the same methodology, I used to think my old car might have up to 2 gallons left ( 55 litre tank) when it read zero miles range, and I certainly drove 30 miles after it read zero with no untoward effects.) !  I'm certainly less inclined to drive far on "empty" in the new car as there seems to be less "reserve".
 
« Last Edit: May 15, 2021, 11:21:05 AM by Aidan »
2020 Mazda 3 2.0 GT Sport Tech Skyactiv G (Gen 4)
2013 Mazda 3 1.6 Tamura (Gen2)
2008 Mazda 3 1.6 Takara saloon (Gen1)
1999 Rover 416
1995 Rover 414
1991 Rover 214 ( later Rover 400 size)
1987 Ford Escort mkIV  1.3
1981 Ford Fiesta 1.3L
1975 Ford Escort mk2 1.1
1971 Ford Escort mk 1 1.1

Offline Engineer Andy

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Re: The Mazda 3 Fuel Economy Thread
« Reply #835 on: May 21, 2021, 11:56:04 AM »
Over its lifetime with me, My 2013 1.6 Gen 2 Tamura averaged about 37mpg. I think the best ever figures I achieved were on a weeks holiday in Scotland with 2 long motorway trips and then cruising around at 60mph max, when I averaged around 44 mpg. I was still getting the same sort of figures at 75000 miles as I did at 10000, so although the normal figures are not outstanding the engine was still performing well.  My new skyactiv G 2.0 model now has 3500 on the clock and is returning figures of +/-  40mpg on my normal (13 miles each way) commute & usage, calculated brim to brim. ( the computer says 41.3 at present including weekend short distance trips).

 A question:  I'm getting over 400 miles out of the 51 litre tank on the new car - I filled it to the brim when it read 2 miles range & got 47 litres in.
( I know that doesn't mean there were 4 litres left in the tank as I had filled the tank plus the filler pipe).  Has anyone driven "into the red" and how close to empty are you really, when the computer says  zero miles?.

( Using the same methodology, I used to think my old car might have up to 2 gallons left ( 55 litre tank) when it read zero miles range, and I certainly drove 30 miles after it read zero with no untoward effects.) !  I'm certainly less inclined to drive far on "empty" in the new car as there seems to be less "reserve".

My gen-1 car has managed to keep its 40-41mpg (average over each year) throughout it's entire 15 year life.  Just goes to show what a combination of good design and maintenance can do.

As regards the 'remaining miles' on the trip computer vs what you can fill up with, the former, as well as the 'low fuel' warning light are quite conservative these days for most makes of car.  I'd rather they do that than under-read, so it's all about judging what each car will show vs the reality.

Whilst I still run my car down to lower than a 25% fuel on the guage before refilling, just to save on the number of trips I need to make to the filling station, I will not run the car when the 'remaining miles' on the trip computer reads zero any more - too risky (I once did this on my old car, forgot I was doing so and ran out of fuel on the A1 - never again!.

I'm not sure whether you fill you cars right up to the brim (i.e. the end of the filler pipe) - technically, we shouldn't (I often do if I know I'll be going a reasonable distance after filling up), as it can damage the breather system if repeatedly done, but I suspect the car will inevitably have about 5-8 Litres (1-2 Gal) left when the 'zero miles' appears, likely about 30-50 miles more when the 'low fuel' warning light illuminates, due to the odd shape of the tank and where the fuel suction point is.

I manage to get around 380 miles out of my car's 55L tank (minus the above margin left in it) in the dead of winter, about a maximum of about 460-470 under ideal conditions (late spring - no A/C needed for either heating or cooling) and when driving at a constant 60mph a lot, and around 420 average over the year.  But then I rarely need to drive at 70mph and appear to be quite a light-footed (not Capt. Slow though) driver anyway, having got an average of 52-53mpg out of my old 90s 1L Micra compared to the official average of 47-48.

Saying that, when I do for my annual holiday to the West Country, the car does manage around the 43-44mpg mark despite doing most of the journey on motorways/dual carriageways at 70mph - probably because the traffic is relatively light (I go out of the normal holiday season), so less accelerating and braking needed, which wastes fuel.

Your mpg should go up (to about 43-47 ave. I suspect) as the engine properly runs in/you get used to driving it and as the tyres wear, better still if you have only recently bought the car, as it won't have accounted for the warmer weather and longer days yet which will help.  I test drove a CX-3 2L auto back in early 2017 and that managed a shade under 40, so yours sounds about right.
« Last Edit: May 24, 2021, 12:19:14 PM by Engineer Andy »

Offline Aidan

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Re: The Mazda 3 Fuel Economy Thread
« Reply #836 on: May 22, 2021, 07:27:42 PM »
Thanks for the reply Andy. 

380 - 400 miles is the sort of range I was getting from my Gen 2 1.6 Tamura but that was when the 55 litre tank was reading "empty" ( zero miles range).   With my commute only being 13 miles each way and with the first 2 miles in a morning in town with a cold engine, I don't think the car got a chance to "make up for" the short weekend trips that drag down the average figures. I was happy that on a long trip I could average 44mpg & I'm looking forward to seeing how the new car performs on the annual trip to Scotland.  I've been on holiday this week and have had a couple of trips up the Yorkshire Dales which has produced an improvement in my latest consumption figures- 44.02 mpg from the last tank full, & the car says 41.8 mpg from when I reset the computer when I got the car. :)  I drove 10 miles after the trip computer said zero and got 46.9 litres in when I filled up (including the filler pipe). 
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Offline Engineer Andy

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Re: The Mazda 3 Fuel Economy Thread
« Reply #837 on: May 24, 2021, 12:27:21 PM »
Thanks for the reply Andy. 

380 - 400 miles is the sort of range I was getting from my Gen 2 1.6 Tamura but that was when the 55 litre tank was reading "empty" ( zero miles range).   With my commute only being 13 miles each way and with the first 2 miles in a morning in town with a cold engine, I don't think the car got a chance to "make up for" the short weekend trips that drag down the average figures. I was happy that on a long trip I could average 44mpg & I'm looking forward to seeing how the new car performs on the annual trip to Scotland.  I've been on holiday this week and have had a couple of trips up the Yorkshire Dales which has produced an improvement in my latest consumption figures- 44.02 mpg from the last tank full, & the car says 41.8 mpg from when I reset the computer when I got the car. :)  I drove 10 miles after the trip computer said zero and got 46.9 litres in when I filled up (including the filler pipe).

To be fair, my car has rarely ever done much in the way of short trips during its 15 year life, at most 'mixed driving' for journeys on both faster-flowing roads and in built-up areas.  I actually actively avoid using it for short trips (i.e. under 5 minutes/3 miles) to the shops, etc, and luckily I live close enough to my home town's shopping areas to be able to walk there in 15 minutes (nice exercise as well).

Me also regularly filling right up to the top of the pipe (but always doing so before a 10 mile+ run, never at the end, so the fuel never stays in that part of the pipe for long) probably gives another litre/8-9 miles of driving over someone who fills up until the nozzle clicks off automatically.
« Last Edit: August 01, 2021, 08:43:35 PM by Engineer Andy »

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Re: The Mazda 3 Fuel Economy Thread
« Reply #838 on: July 31, 2021, 09:31:14 PM »
So, 2018 Sport Nav 2.0 petrol, feel free to correct any of my calculations...
Brimmed the tank, drove the car, a mix of town, mostly 60mph roads and occasional 70mph motorways, a fair cross section but I do drive for economy most of the time.

At 426 miles (with 70 miles still left on the computer...so say 35 in reality, I can get over 450 to the tank.
Brimmed it again, £50.32, 37.5 ltr or 8.24 gallons
426 ÷ 8.24 =51.59 actual mpg
Computer showed 52.5 mpg average so reasonably close to reality in my case.

11.8 p per mile, so each 30 mile commute costs IRO £3.50

As an aside, I reset my computer one day en route to work, a 60mph road.  I did around 10 miles and the average showed up at 62mpg.  That doesnt include start up, acceleration...so perhaps when you see the manufacturers figures quoted, you need to think that's what you can best achieve when you're actually rolling at those speeds and disregard the start up, acceleration  which inevitably brings the headline figure down.

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Re: The Mazda 3 Fuel Economy Thread
« Reply #839 on: August 01, 2021, 08:50:04 PM »
So, 2018 Sport Nav 2.0 petrol, feel free to correct any of my calculations...
Brimmed the tank, drove the car, a mix of town, mostly 60mph roads and occasional 70mph motorways, a fair cross section but I do drive for economy most of the time.

At 426 miles (with 70 miles still left on the computer...so say 35 in reality, I can get over 450 to the tank.
Brimmed it again, £50.32, 37.5 ltr or 8.24 gallons
426 ÷ 8.24 =51.59 actual mpg
Computer showed 52.5 mpg average so reasonably close to reality in my case.

11.8 p per mile, so each 30 mile commute costs IRO £3.50

As an aside, I reset my computer one day en route to work, a 60mph road.  I did around 10 miles and the average showed up at 62mpg.  That doesnt include start up, acceleration...so perhaps when you see the manufacturers figures quoted, you need to think that's what you can best achieve when you're actually rolling at those speeds and disregard the start up, acceleration  which inevitably brings the headline figure down.

Decent real-life figures showcasing the significant improvement in mpg between the 'old' port-injected petrol engines of the gen-1 and 2 cars and the Skyactiv-G ones in the gen-3 and 4 cars - you achieved (seemingly on a similar diriving pattern to mine) around 25% better mpg with an engine that is 20% more powerful in a heavier (albeit sleeker-shaped) car.  The Skyactiv-G engined cars regularly get nearer to the claimed mpg (unless driven 'spiritedly') than many other makes.  Their diesel equivalents don't fair so well though.

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Re: The Mazda 3 Fuel Economy Thread
« Reply #839 on: August 01, 2021, 08:50:04 PM »