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Author Topic: Extremely poor MPG  (Read 5181 times)

Offline Deangti07

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Extremely poor MPG
« on: November 09, 2019, 02:20:38 pm »
My GTI is getting very bad MPG im getting about 17 to 18 MPG in town this is london in heavy traffic  and on the motorway I can get about 31MPG max that is me being very careful and cruising  at 70mph I have also noticed a nosie when im accelerating its like a hissing sound im not sure if its a boost leak I have a K&N induction kit so not sure if its that or if it is a boost leak but really struggling to get over 17MPG in london When i brought the car i was told it may have a stage one Remap and it does have a piston diverter valve think its the D version what could be causing me to get 17mpg?
« Last Edit: November 09, 2019, 04:40:47 pm by Deangti07 »
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Offline Faz

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Extremely poor MPG
« Reply #1 on: November 11, 2019, 03:26:00 am »
I get around 16-18mpg around town I don’t know if thats normal or not, the only mod is a ramair intake that is it all stock apart from that.

So if it is normal considering your car is stage 1 as well doesn’t seem too bad.


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Offline colesey

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Re: Extremely poor MPG
« Reply #2 on: November 11, 2019, 06:22:34 am »
Your in town mileage sounds about right but you should be able to get 40mpg cruising at 70. My car is also stage 1 but with Vis hpfp.
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Offline Deangti07

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Re: Extremely poor MPG
« Reply #3 on: November 11, 2019, 12:18:09 pm »
I cant get 40mpg on motorway max i got was 31 mpg
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Offline Mark_DF05

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Re: Extremely poor MPG
« Reply #4 on: November 11, 2019, 12:21:10 pm »
Town figures sound about right, especially heavy traffic. Not often have I seen 40mpg when cruising on the motorway, 35mpg is more about right for me.


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Offline Ytee

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Re: Extremely poor MPG
« Reply #5 on: November 11, 2019, 01:02:26 pm »
Same. The GTI isn't very efficient in heavy traffic. I get less than 20mpg when doing the school runs as well. To consistently pull 40mpg I'd have to be doing around 60mph I reckon. 30 - 35mpg is the norm on longer runs the way I drive :)

That said, if you're sure you have a problem, maybe check/change the EGR valve. If it's on the way out it could be causing increased fuel consumption.
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Stage 1 '07 Mk5 GTI

Offline kpowell911

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Re: Extremely poor MPG
« Reply #6 on: November 11, 2019, 05:41:46 pm »
Quote from: Mark_DF05 on November 11, 2019, 12:21:10 pm
Town figures sound about right, especially heavy traffic. Not often have I seen 40mpg when cruising on the motorway, 35mpg is more about right for me.

Exactly the same for me. Ive only ever saw 40mph when I did a 54mile journey at circa 60mph.
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Offline Faz

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Re: Extremely poor MPG
« Reply #7 on: November 11, 2019, 05:52:31 pm »
Max mpg I have seen on my car so far is 33mpg on the motorway and that didn’t last long


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Offline Octoparrot

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Re: Extremely poor MPG
« Reply #8 on: November 11, 2019, 05:55:25 pm »
I've been wondering about my MPG recently, I don't think I've ever seen better than 34MPG on a very gentle run. A tank of fuel usually gets me around 300 - 350 miles. I'm in no way leadfooted and the car has a Bluefin stage one on it and is totally standard otherwise. Does this seem reasonable?
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Offline colesey

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Re: Extremely poor MPG
« Reply #9 on: November 11, 2019, 07:06:32 pm »
The best I have seen from my car (k03 revo stage 1) on a long motorway run to catch the car ferry in Poole was 42mpg. That was fully loaded in light traffic in summer with a decent average speed. Shell VPower, 35psi in the tyres.
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Offline Deangti07

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Re: Extremely poor MPG
« Reply #10 on: November 11, 2019, 08:03:16 pm »
When the traffic is really heavy im getting 15mpg in london really don’t know how its that bad im thinking i got a boost leak
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Offline Faz

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Re: Extremely poor MPG
« Reply #11 on: November 11, 2019, 10:08:46 pm »
Quote from: Octoparrot on November 11, 2019, 05:55:25 pm
I've been wondering about my MPG recently, I don't think I've ever seen better than 34MPG on a very gentle run. A tank of fuel usually gets me around 300 - 350 miles. I'm in no way leadfooted and the car has a Bluefin stage one on it and is totally standard otherwise. Does this seem reasonable?

I’ve not seen anywhere near that on a full tank is that including motorway driving too? Best I’ve seen on a full tank is around 220 with Tesco momentum. But then again as much as I try not to I end up putting my foot down


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Offline ljc19630

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Re: Extremely poor MPG
« Reply #12 on: November 11, 2019, 10:49:26 pm »
The more you put in the more you get out - Simples


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Offline pudding

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Re: Extremely poor MPG
« Reply #13 on: November 15, 2019, 01:51:09 pm »
Over 5 years of ED30 ownership in standard and tuned trims, it's averaged 28mpg. That's a mixture of town driving, fast B roads and motorways.  Everything is spot on in the VCDS logs, so it's just how they are....and my driving  :grin:

My R32 delivered 26mpg very consistently, no matter how hard or gently I drove it, so a 2mpg improvement for 70 more lbft and 60 more ponies isn't bad at all.

The MK7 and 7.5 are apparently a lot better on fuel.  According to a lot of owners, mid to high 30s being easily achievable as a long term average....for the GTI that is.  Not sure about the R.

No one buys a GTI for mpg anyway.  That's what the GTD is for  :smiley:
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2007 ED30 | 2009 TDI 140 | 2016 BMW 330D

Offline E8RNX

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Re: Extremely poor MPG
« Reply #14 on: November 15, 2019, 02:56:21 pm »
Stage 2+ MK5 GTI Owner - Pretty much only drive in city, loads of stopping and starting, hills etc. Never get over 15MPG, £40 at least a week. When on motorway since I’ve been mapped I managed to get 40MPG which was a big improvement but MPG has worsened with the type of driving I do (only city)

Before mapping MPG used to average around 18MPG with same style of driving but hey I’m loving it so defo worth it 👍🏼
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