MK7 GTD - Real Life MPG

[madmax889]

Right I have had the mk5 GT Sport and and the mk6 GTD. Waiting for my mk7 gtd

I have driven the mk6 with and without the DTUK tuning box. I can say that I found an increase in mpg especially when I drove from Cornwall back to London. Yup I was a dummy fitting the box to the mk6 in Cornwall when we started having all the bad weather lol.

Once installed Jesus you can feel the difference in the car straight away. The mk6 went to 65mpg that was driving at a constant speed for a long period of time. It does work if your frugal. But when around town I actually used a different map on the box so the power delivery was smoother and had less of a bang right at the start. This was better around town. I still think I will take Andrews offer and get the box changed and setup for the mk7 without fail. My mk7 has just over 8000 on the clock so am hoping it's already sorted its mpg side of things out. But seriously can't wait for the box to be added.

I'll definitely give the normal side of the car a try first without then with the box. But on the test drives that I did I did notice the 5th and 6th gear were a little flat compared to both the mk5&6. But hopefully the box will cure this issue.

Has anyone tried the Pedal box? Instead of having the extra grunt from the tuning box. Why not just try the pedal box instead as it doesn't increase power on the car.

[dippy_x]

Drove back up from Manchester to Edinburgh today.  Got a respectable 52.7MPG.  Two turns away from home the car started a regen.  Revs at 1000 and stop start not functioning.  Got home and switched the car off and the fans were still running.  I'm amazed that during a 225 miles / 4 hour journey the best time it could find to regen is when your back on a normal city road and about to end your journey!

[linc-dub]

3623 miles in and long-term is 47.1 mpg

[AlanH]

Getting a lot of drag from those mudflaps. 

[monkeyhanger]

Drove back up from Manchester to Edinburgh today.  Got a respectable 52.7MPG.  Two turns away from home the car started a regen.  Revs at 1000 and stop start not functioning.  Got home and switched the car off and the fans were still running.  I'm amazed that during a 225 miles / 4 hour journey the best time it could find to regen is when your back on a normal city road and about to end your journey!

Me too. Been on an 80 mile round trip, with oil temps generally up in the 98 to 102C for the vast majority of the journey. I would imagine that the DPF got hot enough for plenty of passive regenning which could have emptied the system, yet the fans were blaring when I got home, despite the oil temp settling back down to 92C.

The question is then....does the fan continuation always signal the static continuation of an interrupted DPF regen, or perhaps after an extended motorway run, could the DPF be clear and the fan is kicking in purely to cool down the DPF to protect it from overheating after the car has stopped? I'd like to think that this is the case, otherwise it would seem that by design, despite perfect passive regen conditions, VW has set the car not to take advantage of the situation, but makes the car regen at set intervals or set loading thresholds. This could also explain stop-start being disabled - if the fans need to be blaring to cool the DPF when the car is static, there is probably no economy advantage in allowing the engine to switch off and have the fans blaring instead, therefore stop-start is disabled.

I can't at this point tell what my DTUK boxed mpg is until I fill up, but current gauge readings would seem to indicate that actual mpg isn't a million miles away from MFD indicated mpg. The gauge was reading exactly half a tank (from full) when I hit 245 miles done. From experience, 1/2 a tank indicated is a little more than 1/2 a tank consumed. I normally do about 225 miles on an indicated 1/2 tank to get an actual 43mpg. My educated guess on current actual mpg to 245 miles in, is around 46.8mpg, although that has been bolstered by my mid range run, so it will drop again as I do a week of commuting to finish the tank. The indicated mpg for the 2 x 40 mile legs was 51.3 outbound and 53.8 on the way back.

[AlanH]

Similar experience a couple of weeks ago. 200+ mile run up to Northumberland without stops, pulled into the drive and the fan kicked in and ran for around 5 minutes.

[monkeyhanger]

Similar experience a couple of weeks ago. 200+ mile run up to Northumberland without stops, pulled into the drive and the fan kicked in and ran for around 5 minutes.

I really do think that on a run like that, there's no chance the DPF isn't clean as a whistle, but the car needs to cool down the DPF system - it probably retains heat a lot longer than the rest of the engine system without a cooling intervention.

[Mk1Macca]

Finally, on my 25 mile commute home yesterday of 25 miles - a mixture of a roads, town and a smudge of dual carriage ways - I saw 54mpg. 2000 miles on the clock, so
It's seems it's finally getting better.

[Rainbow 6]

My GTD DSG has now done 5,500 miles, the fuel consumption is terrible, far worst than the BMW 120D Msport auto it replaces; I haven't seen over 50 mpg on any journey, typically it runs at 40 -42, long term is approx 40mpg, not what the car was sold on. Car has been checked over by VW, nothing out of ordinary.
How can all car manufacturer's get away with this false advertising?

[monkeyhanger]

My GTD DSG has now done 5,500 miles, the fuel consumption is terrible, far worst than the BMW 120D Msport auto it replaces; I haven't seen over 50 mpg on any journey, typically it runs at 40 -42, long term is approx 40mpg, not what the car was sold on. Car has been checked over by VW, nothing out of ordinary.
How can all car manufacturer's get away with this false advertising?

They're all at it. Since the inclusion of stop start, it is a huge part of the skew from real life results to EU testing cycles (how many of us here spend 24% of our commute waiting at lights/roundabouts?).

Compared to previous gens, the length of time taken to warm the car up to the point that the DPF is actually able to burn captured soot is longer. If you're not doing 15 miles each way on your commute then you'll see the active regens influencing your mpg negatively. 40mpg overall average isn't suspiciously low to indicate fault. For me on a 12 mile commute, I generally see a 43/44mpg average, not driving like a nun. It can get as high as 47mpg for the same journey if I have just seen a regen recently, or if the weather is a little warmer. Longer (40 miles) journeys maintaining 80mph, I can see about 53mpg indicated.