MK5 Golf GTI

All Things Mk5 => Mk5 General Area => Topic started by: Deangti07 on November 09, 2019, 02:20:38 PM

Title: Extremely poor MPG
Post by: Deangti07 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?
Title: Extremely poor MPG
Post by: Faz 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.


Sent from my iPhone using Tapatalk
Title: Re: Extremely poor MPG
Post by: colesey 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.
Title: Re: Extremely poor MPG
Post by: Deangti07 on November 11, 2019, 12:18:09 PM
I cant get 40mpg on motorway max i got was 31 mpg
Title: Re: Extremely poor MPG
Post by: 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.


Title: Re: Extremely poor MPG
Post by: Ytee 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.
Title: Re: Extremely poor MPG
Post by: kpowell911 on November 11, 2019, 05:41:46 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.
Title: Re: Extremely poor MPG
Post by: Faz 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


Sent from my iPhone using Tapatalk
Title: Re: Extremely poor MPG
Post by: 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?
Title: Re: Extremely poor MPG
Post by: colesey 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.
Title: Re: Extremely poor MPG
Post by: Deangti07 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
Title: Re: Extremely poor MPG
Post by: Faz on November 11, 2019, 10:08:46 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


Sent from my iPhone using Tapatalk
Title: Re: Extremely poor MPG
Post by: ljc19630 on November 11, 2019, 10:49:26 PM
The more you put in the more you get out - Simples


Sent from my iPhone using Tapatalk
Title: Re: Extremely poor MPG
Post by: Pudding 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:
Title: Re: Extremely poor MPG
Post by: E8RNX 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 👍🏼
Title: Re: Extremely poor MPG
Post by: Pudding on November 15, 2019, 04:34:42 PM
No petrol engine is efficient on short journeys, especially over winter.   The amount of fuel chucked in for cold starting and during warm up is unreal.  The injectors actually fire twice for a certain time frame to heat the cats up.  All that lovely moolar poured down the drain  :grin:

Cause and effect - the longer it takes for an engine to warm up, the more fuel it will use.   The best way to treat a petrol engine is to get on it, hard, as soon as possible.  Get some heat and air into it asap.

Unfortunately such driving conditions is also hard on the engine oil, so that will need changing more regularly as well if the engine rarely gets thoroughly heated through.
Title: Re: Extremely poor MPG
Post by: Deangti07 on November 21, 2019, 11:10:07 AM
I don’t think 15mpg is normal for these car I think i have a serious fuel problem my friends m4 does the same mpg as mine Any ideas of what could be wrong ?
Title: Re: Extremely poor MPG
Post by: bobby_fodge on November 21, 2019, 11:36:00 AM
service it, oil & filter, fuel filter, plugs, if not done recently.

What fuel are you using?

Have you scanned it to check for any fault codes?

Are any brakes binding?
Title: Re: Extremely poor MPG
Post by: Pudding on November 21, 2019, 12:44:42 PM
As above, especially the brakes.  The rear calipers are notorious for seizing up. 

But as we've discussed, 15mpg around London and low 30s on a run is not abnormal.

You can't compare a 12 year old engine to a modern one with the latest EU emissions control, but it sounds like the M4 is equally poor at urban speeds which just cements what we've already said.  It's just how petrol engines are.  You can either suck it up or sell it and buy a Nissan Leaf.
Title: Re: Extremely poor MPG
Post by: snowball05 on November 21, 2019, 08:21:07 PM
I get about 35mpg on my 25 mile run to work down the M3 @ 70mph. If I get caught in traffic and slow to 60mph it goes up to 37-38mpg. Stock Mk5, manual, 65000 miles.


Sent from my iPhone using Tapatalk
Title: Re: Extremely poor MPG
Post by: OllieL on November 26, 2019, 08:09:32 AM
I get around 300-320 miles from a tank with my commute being a fairly stop/ start commute and an average of 30MPG.

I can often see low 30’s on the way to work (less traffic the times I leave), with mid 20’s on the way home.

I thought this was reasonable for a GTi of this age (130K BWA)

Ollie


Sent from my iPhone using Tapatalk
Title: Re: Extremely poor MPG
Post by: Dan_FR on November 26, 2019, 01:39:24 PM
My tank average is usually 18MPG. Combination of short journeys, stop/start driving slowing to a crawl of speedbumps and a lead foot once it gets up to temps. Can still get 400+ miles all motorway

Not comparable as everyone's driving style and road conditions will be different.
Title: Re: Extremely poor MPG
Post by: E8RNX on November 27, 2019, 11:57:29 AM
I average 15 and under pretty much all the time. However on a run I can easily achieve amazing numbers.. other day constant flowing traffic, no heavy foot and got 28MPG over about 5 miles. Just depends on driving with these cars really, the second you start stopping or going uphill your MPG won’t remain the same and that’s why they aren’t economical :).

On motorway I have achieved 40MPG max and if you didn’t see from previous post I’m Stage 2+ KO3.
Title: Re: Extremely poor MPG
Post by: Pudding on November 30, 2019, 05:45:26 PM
My tank average is usually 18MPG. Combination of short journeys, stop/start driving slowing to a crawl of speedbumps and a lead foot once it gets up to temps. Can still get 400+ miles all motorway

Not comparable as everyone's driving style and road conditions will be different.

Indeed.  I've changed jobs recently and my 'miles to empty' is creeping closer to 400 a tank with every fill up, compared to 330 in my old job.