5 mpg - maxxed out the MFD!

[FroGTI]

Since my remap at the weekend, I have been driving around pretty gingerly to avoid anything snapping I just went out on a nearby motorway and selected the instant fuel consumption setting on the MFD. At 70-80 mph, it was hovering around 35-40 mpg, but then I put my foot down as far as it would go... I got to about 115 mph (for a few seconds only and the road was deserted). OK, the pick-up was very good, but during the acceleration consumption went up to 5 (yes, FIVE!) mpg (50 litres/100km) and refused to go any further.

I think I maxxed out the computer. Does this happen on the stock car (I should have tried before I got mine done, but I didn't). 5 mpg is terrible

[nige_s]

I think you'll find almost any car under hard acceleration will dip its mpg below 10, even 1.0l Polo

[A7 UFO]

obviously accelerating hard is bad for fuel consumption. 

I've never known anyone drive gingerly just because of a remap.

[AlanD]

I think you'll find almost any car under hard acceleration will dip its mpg below 10, even 1.0l Polo

Yep, what he said ^

I try and avoid looking at MPG these days and just enjoy the car (I always fail, I always have to have a quick look at the end of the journey, its really anoying me now lol, just want to not be able to care lol)

[mac7]

Instant mpg readings are fairly meaningless. They are only really useful when you are cruising under constant throttle. As the computer is probably just looking at intake manifold pressure, all it really tells you is how wide open you've got the throttle and how much load the engine is under. With the accelerator nailed and the load of pushing a car through the air at 100+ I'm not surprised you only get 5mpg - at that instant and under that set of conditions.

Average mpg read after covering a reasonable distance gives you a more meaningful (if slightly optimistic) value.

[FroGTI]

OK, thanks for your reassuring answers

I try and avoid looking at MPG these days and just enjoy the car (I always fail, I always have to have a quick look at the end of the journey, its really anoying me now lol, just want to not be able to care lol)

Lol, I do the same. I try to keep it on Speed or Oil Temp, but I can't resist having a look at the Avg Fuel Cons from time to time. It's a double whammy, because not only am I annoyed when I see 26mpg, but I'm also annoyed with myself for looking and worrying about it

[Rolfe]

I set the display on average fuel consumption last night, just as an experiment.  The figure when I reached work was a round 40mpg.  I have to point out that I have a straight 10-mile cruise up an A road with no lights, roundabouts or anything, and because of other traffic I was doing 60mph for much of it.

I'm actually not getting as good fuel consumption as I was anticipating, overall, as yet.  Though it's hard to say as I haven't used a tankful yet.  Did I hear someone say that fuel consumption improves once you hit 1,000 miles on the clock?

Rolfe.

[nige_s]

I find any sustained driving at 55-60 returns excellent mpg.  My 8v managed 50+mpg on a long stretch of 50mph through roadworks on the M1 once, was really surprised.  Once you hit 70mph things start going titz up but then you get there quicker and its more fun.

[mac7]

Did I hear someone say that fuel consumption improves once you hit 1,000 miles on the clock?

All your mechanical bits should be bedding in nicely by about 1000-1500 miles plus I guess the engine management and gearbox computers will have adjusted to your driving style (and you to the car) so I'd imagine a small increase.

Out of interest, did everyone check their tyre pressures on receiveing the car? It's surprisingly common for new cars to hit the road with them under/over inflated.

[matchboy]

and because of other traffic I was doing 60mph for much of it.

Rolfe.

you do realise you're driving a GTI and not a peugeot anymore?!?  60?!