I have just had to fill my MY2017 Rapid Spaceback since filling it on collection 2 weeks ago. According to the MIB2 the adverage fuel consumption was 50.8, which I knew wasn't right having covered under 500 miles on a tank.

The actual consumption from this tank was 45.4, has anyone else noticed a huge difference between what the car wants to believe and the truth?

My previous Octavia was spot on with the trip computer figures, I'm hoping the consumption improves on the Rapid as it's quite bad for a diesel.

As with all cars, the trip computer is optimistic. Mine is off at about 5%. You can, however, adjust it with VCDS.

Mine is 6% optimistic too, but the 1.2 tsi did loosen up a lot in the first 2000 miles. 39mpg on the first tank, about 50mpg on the fifth.

Maxidot is always very over-optimistic on consumption. If you look at my Fuelly history (see my sit below) you will find two years worth of real consumption dads for the 1.2 TSi Rapid.

If I click on your Fuelly stuff in your sig it takes me to the Fuelly site, where it says your average mpg is 36.6.

So why does the right-hand image in the sig say 43.9?

 

What am I missing?

On the site, on the left hand side at the top of the menu, make sure the units drop down is set to UK and not US or one of the silly European metrics.

Ah! Cheers.

Mine is out by between 5% and 10% (optimistic of course!) depending on whether there's an R in the month

As with all cars, the trip computer is optimistic. Mine is off at about 5%. You can, however, adjust it with VCDS.

 

How?

How?

If I'm not mistaken, you have to go to [17-Instruments], then select [Adaptation - 10].

Somewhere in the list of adaptations there will be an item related to consumption.

The default value is 100%. I think you raise this value if the computer is optimistic.

I'll have to check and get back.

seems to be for me lower flow rates are worse than high, so if I drive gently I get a higher % deviation than if I boot it and have higher fuel flow it is more accurate

 

that seems to me to say smaller more efficient engines suffer more from flowmeter accuracy than larger engines so the flow rate for the smaller engines must be near the bottom end of the operating range for these flow meters

On-screen consumption figures are, for me, purely for entertainment. In realtime mode there are two points of fun...hocw low a number can you get during spirited acceleration and how high a number can you get on a trailing throttle cruise? My two figures are 9mpg and 300mpg, (briefly), before the display goes off as I guess that's the system's highest display value.

For true fuel economy figures just use Fuelly, or a pen and paper, and calculate between fill-ups. And don't forget...new engines etc are "tight" and do loosen up over some 000's of miles.

I'll have to check and get back.

Did you check it?

Did you check it?

Yes, sorry for not reporting back, I forgot.

I was right, you have to go to the Adaptation of the Instruments and find Display correction of consumptions and operating range from the list of adaptations. Then change the percent from 100% (default) to the desired value.

Edited 26 July, 20169 yr by eyegr