MK7 GTD - Real Life MPG

[monkeyhanger]

Sainsburys vs Esso there was almost nowt in it. Haven't done Asda yet because my most frequented Asda (Gosforth) doesn't have a fuel station so i'd be going out of my way to fill up at the Benton one.

I'll see if the regens get worse over the winter before I go back. I'm assuming they will do because over the last week, my car is taking an extra 2 miles to get to temp (90C).

[dippy_x]

How many miles are you taking to get to 90 degrees?

Temps around here have been between 5 and 6 degrees the last few days.  Takes my GTD 4.5 miles to get oil temp to about 60 degrees.  By about 7.5 miles I seem to hit 90 degrees.  My journey to work is sbout 11 miles each way.

[monkeyhanger]

How many miles are you taking to get to 90 degrees?

Temps around here have been between 5 and 6 degrees the last few days.  Takes my GTD 4.5 miles to get oil temp to about 60 degrees.  By about 7.5 miles I seem to hit 90 degrees.  My journey to work is sbout 11 miles each way.

Seems I have a similar commute length to you - 12 miles. About 8 miles in is getting me to 90C, unless I drive like a nun. First 1.5 miles is on 30/40 roads, no congestion, next 6 miles is on dual carriageway - straight up to 80mph if traffic volume allows, if not then 60mph when the road is a bit busier (difference between holding 60 and 80 can add up to 2 miles onto the distance taken to reach 90C). Last 4.5 miles is on mixed roads, 30 - 60mph, no congestion, but a few roundabouts etc - this is where the temp varies between 90 and 95C for some passive regen if i'm lucky. Had around 4C average when I go to work (7am) over the last week up to Christmas eve. This morning has seen quite a thick frost, will be heading off for the match soon (Newcastle vs Stoke), and everything is defrosted.

About 5 miles for the oil temp to be registering in the MFD (>50C).

My GTD takes a good deal longer to get to temp than my Scirocco. Water gets to temp a mile quicker on the GTD, but oil takes about 2 miles longer to get to 90C. The GTD's oil is about 40C behind the water on the warm up, on the Scirocco the oil was about 20C behind the water on warm-up. The GTD also seems to cool down a lot quicker between trips 30 mins to 2 hours apart.

[monkeyhanger]

BP fill-up looks promising. A very leisurely 15 mile journey across a hilly route home yielded 52mpg at 2C ambient temp, and the engine was stone cold at start journey.

[noobmonkey]

Well, just did a return trip of 185miles, and it was 49.2mpg on the way up and 50.4mpg on the way back - much much better, still not amazing, considering it was easy driving, on a mix of eco and normal to test it out.  I did notice, one blip in sport, and that shot down about 5mpg almost instantly! - but it was fun!!

Bp working much much better, but i assume the longer miles aint doing it any harm!

[KyleB]

Did 210 miles from my parents back to the North East yesterday. On the way down to see them I used ACC and stuck it at 65mph all the way and got 53mpg.

Coming home yesterday I was caning it between 80-100mph and got 47.7mpg. Pretty happy with that to be fair, I know it's a way off the advertised mpg but compared to my last car (1.4 Ibiza) its a lot better. Cars jut done 5500 miles too.

Seeing similar warm up times to you guys, although yesterday I'd say took about 8 miles to get to 90 due to the cold ambient temp.

[mike_f]

Did 210 miles from my parents back to the North East yesterday. On the way down to see them I used ACC and stuck it at 65mph all the way and got 53mpg.

Coming home yesterday I was caning it between 80-100mph and got 47.7mpg. Pretty happy with that to be fair, I know it's a way off the advertised mpg but compared to my last car (1.4 Ibiza) its a lot better. Cars jut done 5500 miles too.

Seeing similar warm up times to you guys, although yesterday I'd say took about 8 miles to get to 90 due to the cold ambient temp.

Pretty much what I am getting having run the car for 4500 miles. Haven't noticed any increase or running in gains worth mentioning.

If I keep it below 70 I can get just above 50 mpg on a run with adaptive on.

If I push it to 75 I get about 48mpg...

I have my car in the garage today to have a look at it after I complained to VW about it during their follow up call. They have already phoned me to say there are no faults logged with it (not that I expected any).

Some interesting reading here if you compare the Mk7 to the mk6 GTD.

http://www.golfgtiforum.co.uk/index.php?topic=176242.200

Seems despite boasting a large increase in economy between the MK7 and MK6 the reverse is true - it is completely less efficient.

Overall I am disappointed given that I waited for the MK7 for 6 months based on the stated fuel consumption figures.

Given that I came from an Audi S3 which was about 30mpg - the new generation doing high 30s on a run, considering that petrol is cheaper than diesel and the new S3 is a 300 bhp motor then I don't see how VW have missed the point with the GTD....

[monkeytennis]

Interesting thread, after 2.5k and only running premium diesel (mostly BP) since new my GTD is returning 42MPG on average, luckily this is a company vehicle and I pay per mile as I'd be sadly disappointed if this was my private motor. This is 42MPG with sensible driving too, no hammering it around.

[2014GTi]

I've said this before and I will say it again, don't expect anything near the manufacturers figures until your engine has cover between 10-20k miles. 

[monkeyhanger]

I've said this before and I will say it again, don't expect anything near the manufacturers figures until your engine has cover between 10-20k miles. 

You can keep saying it, but with my previous 6 TDIs I have never seen appreciable gains with 10 or 20k miles on them. I have also never found it difficult to exceed published combined mpg figures on a 50 mile run doing 90mph on the motorway, from 500 miles into ownership, yet now I find it extremely difficult to get towards urban cycle figures.

The biggest reason for economy improvements is bedding in of components, which is done in the main in less than 2k miles. Ever tighter manufacturing tolerances make engine bedding in far less relevant than ever towards seen improvements.

The average driver with average annual mileage will find it very difficult to get near combined mpg on a regular basis with the MK7.

Actual mpg attained vs last gen 170TDI are about 10% worse. What that says to me is that tech has not moved forward appreciably. 10% more power and 10% worse fuel economy. The new tests are not comparable to the old tests. The goalposts have been moved. Test a MK6 under the same criteria as the MK7 and I have no doubt you'd see official combined mpg 25% higher than published figures. No improvement in real economy IMO and eco tech additions to mask some of that.

My dad now has10k miles on his and he had an average 47mpg indicated over that period. Mpg has not incrementally improved and there has been no noticeable step up in economy since his service.

We will all see mpg improvements when the warmer weather is back and some will attribute this to long term running in rather than the warmer weather. Higher ambient temp leading to shorter warm up times and higher humidity that comes with warmer weather will all help boost your mpg by 10 - 15% over what you are seeing right now for the average miler.

Interestingly, on the MK6 GTD threads, someone does state that since their Bridgestones wore out and the replaced them, their fuel economy improved by 10%. That does seem incredible - 10% economy gains from a change in tyres - can rolling resistance differences between tyres make such a significant difference? I was expecting 3% gains at best from better tyres. Perhaps if VW spent an extra £20 per car they might've had most of us here scraping at least 50mpg on most journeys if there are 10% gains to be had.