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Author Topic: MPG down by quite a bit. Possible causes?  (Read 1512 times)

Offline Craigh1983

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MPG down by quite a bit. Possible causes?
« on: February 19, 2013, 08:59:03 pm »
Hi guys,

My car usually manages around 330mpg most times I fill up with a full tank of petrol. However this month I have only managed 290 mpg and I have driven the car the same, on the same roads so I can't understand why this could be.
Didn't know if there are any possible causes for this?

Also i bought my car a year ago, it has now done 110,000 miles and there are no records of the dv valve being changed? so i wondered if it was worth getting my DV valve changed when I'm next at the garage to the revision G?

Cheers
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Offline GTI-Ross

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Re: MPG down by quite a bit. Possible causes?
« Reply #1 on: February 19, 2013, 10:12:44 pm »
Seriously bro, since changing mine to Rev G, seen a 3-4 MPG increase.....not massive but over the year. I used to think i was my lead right foot...turns out torn DV, get it changed mate :happy2:
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Offline sub39h

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Re: MPG down by quite a bit. Possible causes?
« Reply #2 on: February 19, 2013, 10:19:19 pm »
330mpg mpg? now 290mpg? if i was getting 290mpg from my 2.0T i would not be complaining!
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Offline Craigh1983

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Re: MPG down by quite a bit. Possible causes?
« Reply #3 on: February 20, 2013, 08:10:09 am »
Quote from: GTI-Ross on February 19, 2013, 10:12:44 pm
Seriously bro, since changing mine to Rev G, seen a 3-4 MPG increase.....not massive but over the year. I used to think i was my lead right foot...turns out torn DV, get it changed mate :happy2:

Yea will definately do it. Maybe I will see an increase in performance too?
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Offline Craigh1983

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Re: MPG down by quite a bit. Possible causes?
« Reply #4 on: February 20, 2013, 08:10:45 am »
Quote from: sub39h on February 19, 2013, 10:19:19 pm
330mpg mpg? now 290mpg? if i was getting 290mpg from my 2.0T i would not be complaining!

Lol i'm a bit of a boring driver! :)
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Offline Luka

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Re: MPG down by quite a bit. Possible causes?
« Reply #5 on: February 20, 2013, 08:28:03 am »
3000 miles to a full tank!

If only...  :signLOL:
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Offline ROH ECHT

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Re: MPG down by quite a bit. Possible causes?
« Reply #6 on: February 20, 2013, 08:34:56 am »
If there are no error codes on vcds it is likely a failing maf sensor. But you can check that logging group 002. Or if you know another with a maf you can ask them to borrow theirs to run a test with it. Plug it into yours logging both maf sensors or just take it for a short drive with each maf resetting the mean mpg on the same stretch of road setting cruise at the same for both maf's. Assuming theirs is good you will see a diff in the avg.
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Offline GrayMK5GTI

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Re: MPG down by quite a bit. Possible causes?
« Reply #7 on: February 20, 2013, 11:58:37 am »
Cold weather will hammer your MPG too. Makes a big difference ive found
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Offline andyR43

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Re: MPG down by quite a bit. Possible causes?
« Reply #8 on: February 20, 2013, 01:33:34 pm »
Check your tyre pressures in this cold weather as, when the temperature drops the pressure in your tyres will drop too. This will result in a corresponding drop in MPG so re-inflating them to the correct pressures will restore some of your missing MPG.  :happy2:
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Offline gazon69

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Re: MPG down by quite a bit. Possible causes?
« Reply #9 on: February 20, 2013, 01:45:33 pm »
Quote from: andyR43 on February 20, 2013, 01:33:34 pm
Check your tyre pressures in this cold weather as, when the temperature drops the pressure in your tyres will drop too. This will result in a corresponding drop in MPG so re-inflating them to the correct pressures will restore some of your missing MPG.  :happy2:
mine was doing 14mpg driving steady when cam follower went.
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Offline Craigh1983

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Re: MPG down by quite a bit. Possible causes?
« Reply #10 on: February 20, 2013, 03:01:56 pm »
Quote from: ROH ECHT on February 20, 2013, 08:34:56 am
If there are no error codes on vcds it is likely a failing maf sensor. But you can check that logging group 002. Or if you know another with a maf you can ask them to borrow theirs to run a test with it. Plug it into yours logging both maf sensors or just take it for a short drive with each maf resetting the mean mpg on the same stretch of road setting cruise at the same for both maf's. Assuming theirs is good you will see a diff in the avg.


I did have a new MAF sensor fitted actually when i first bought the car a year ago. I hope it wouldn't be failing this early on?
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Offline homesqueeze

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Re: MPG down by quite a bit. Possible causes?
« Reply #11 on: February 20, 2013, 06:02:34 pm »
My mpg got noticeably lower when my dv was knackered.
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