Author Topic: Mazda 3 2.2 awful mpg  (Read 1908 times)

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Offline pritch1988

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Mazda 3 2.2 awful mpg
« on: January 15, 2018, 12:55:57 AM »
So it speaks for itself. My mpg is awful. From a diesel I'm expecting....high 40s?

But I'm averaging 35-7mpg a full tank is £50 that gets me 330-350 miles.

I've got the most pokey 2.2d you can get, 185bhp and I do like get places but not I'm crazy with my right foot.

So my question is, is this mpg normal? And what should I be getting, I've changed the air filter and stuck some redex through. More expensive shell makes no difference.

Would a remap. Egr clean or hydroclean help?

Any advice please?

Cheers, Sam
« Last Edit: January 15, 2018, 07:09:06 PM by pritch1988 »

Offline cwilliams255

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Re: Mazda 3 2.2 awful mpg
« Reply #1 on: January 15, 2018, 08:01:29 AM »
I have a 2009 2.2d 185 and that’s about what I get most of the time now but my drive is 10 miles a day at an average of about 18mph - so pretty stop start. Overall my trip computer reports 48mpg and hasn’t been reset for 20000 miles or so. On a steady run down to the south of France I managed well over 60mpg. Car is regularly serviced (oil change every 6k), no dpf issues and tyres are Goodyear efficient grip performance at 36/35psi

Your mpg does seem low of if its  not stuck in a city 90% of the time.

Offline Willpower

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Re: Mazda 3 2.2 awful mpg
« Reply #2 on: January 15, 2018, 08:55:47 AM »

I've got the most pokey 2.2d you can get, 185bhp and I do like get places but I'm crazy with my right foot.

Driving style makes a tremendous amount of difference to your mpg.  I know it's difficult when the car is just wanting to go....., but have you tried curbing your enthusiasm for a few days, watch your fuel consumption and see where that gets you  ?
Look at life through the windscreen, not the rearview mirror.
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Offline StevenRB45

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Re: Mazda 3 2.2 awful mpg
« Reply #3 on: January 15, 2018, 01:52:35 PM »
Depends how long you've been measuring it. In the middle of winter with additional electric load from defrosting with some stop start traffic thrown in as well it can happen that it drops that low. However if it's always that low it's either broken or driving style. Do believe that if the DPF or EGR was bad enough to be causing this the car should be displaying a warning light.

Offline pritch1988

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Re: Mazda 3 2.2 awful mpg
« Reply #4 on: January 15, 2018, 07:21:15 PM »
Hello! Cheers for the replies.

Haven't got a heavy foot! I meant to say! Lol.

I agree with the DPF EGR comment. Twice a week have a motorway cruise, 60-70 mile round trip and mpgs around 44mpg few hills and what not. The Dpf regen is the really killer, average goes from 44mpg to 36mpg after a regen. Is that normal?

Cheers

Offline misar

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Re: Mazda 3 2.2 awful mpg
« Reply #5 on: January 16, 2018, 08:39:38 PM »
Unless there is something you havn't mentioned, like many very short trips, it must be doing very frequent regens to get the overall mpg down to 35-37. If so I suspect you have worse problems than poor mpg.

Offline cwilliams255

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Re: Mazda 3 2.2 awful mpg
« Reply #6 on: January 17, 2018, 01:26:11 PM »
My regens are about once per tank and a half I think. Instantaneous mpg is terrible 9mpg or something for 10 minutes but it doesn’t really affect my average as it’s over 20k or so. How often does it do a regen on dpf you reckon?

Offline pritch1988

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Re: Mazda 3 2.2 awful mpg
« Reply #7 on: January 18, 2018, 05:40:38 PM »
Regens every 150 miles i would say, I clock the mileage every tank. Especially when it so crap, regen'd for about 10-15 minutes on the m5 whilst cruising at 70.

I've since put some DPF regen addictive into my fuel, not expecting miracles but at £6. Worth a punt.

Considering a hydroclean and remap at £210 resolve the issue or complete dpf removal at £450 will completely see off any issues.

It's worth adding I brought the car at 37k 2010plate in September. Driven by an elderly gentlemen, my thinking being the car wasn't given time to properly regen during this time? Might be a wee bit clogged but not enough to warrant a dash lights?.


Offline pritch1988

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Re: Mazda 3 2.2 awful mpg
« Reply #8 on: January 18, 2018, 05:45:14 PM »
Unless there is something you havn't mentioned, like many very short trips, it must be doing very frequent regens to get the overall mpg down to 35-37. If so I suspect you have worse problems than poor mpg.

Say I do, 3-400 miles a week. Two journey for work of motorway driving and a work drive of 26miles most my mornings. Definitely do some short drives, tomorrow for instances two 10 minute journeys.

What are these serious issues you speak of?

Offline misar

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Re: Mazda 3 2.2 awful mpg
« Reply #9 on: January 18, 2018, 09:13:02 PM »
Unless there is something you havn't mentioned, like many very short trips, it must be doing very frequent regens to get the overall mpg down to 35-37. If so I suspect you have worse problems than poor mpg.

Say I do, 3-400 miles a week. Two journey for work of motorway driving and a work drive of 26miles most my mornings. Definitely do some short drives, tomorrow for instances two 10 minute journeys.

What are these serious issues you speak of?

You already answered your own question. Cost of DPF replacement or cost/legal consequences of removing it.

Offline audioslaven

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Re: Mazda 3 2.2 awful mpg
« Reply #10 on: January 19, 2018, 12:15:25 AM »
it could be that the DPF is on the way to been full resulting in frequent regens. This would set you mpg down. If you scanned the ECU, you may get some error messages that don't result in a light like DPF regen taking long time.

Offline Ian345

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Re: Mazda 3 2.2 awful mpg
« Reply #11 on: January 19, 2018, 09:24:17 AM »
I have the Gen 3 1.5D

For background info, on the 1.5D, the DPF regens about every 200 to 230 Miles. Clocking just on 60mpg in winter. Living in the country, so not so much stop-start, just tractors!

The DPF regen can take 10-20 minutes, depending on driving style at the time i.e. longer time if pottering along in traffic at low revs.

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Re: Mazda 3 2.2 awful mpg
« Reply #11 on: January 19, 2018, 09:24:17 AM »