Fuel Computer MkV 2.0TDI innacurate ?

[jdd]

I also keep a detailed record of every fuel fill-up in a spreadsheet.
The MFD average for the tank is pretty much spot on every time (TDi Pacific).
The worst it’s ever been is 0.1 l/100km out (fractionally optimistic).

I have also checked the Speedo with a GPS and found it consistently reads about 8-9% lower than the GPS. I’ve found the odometer matches the GPS exactly over a 250k trip.

[jackafrica]

Hi Jackafrica, You failed to mention that your golf has the plug and play tune? Maybe something going on there if it blows a lot of soot out the back mate?
Cheers, Andrew

Hi Andrew,
Smokes with or without the plug and play when you put the foot down. Not all the time though, which for me is the confusing part. No doubt it is a diesel trait or something explainable.

Cheers
Richard

[simonn]

Hi Richard + Readers,

I am a new owner of a 1.9TDI VW Jetta 2010 model.
I too am keeping detailed records on what the MFD displays for average fuel consumption of each refill V's manual calculation of litres / km's *100.
There is a considerable difference, I have only recently written to VWA directly. I hope to have this rectified.

I would love to hear from others about their experiences.

Thanks,
Simon.

[gldgti]

Wow, someone dug up this thread! Last post was 2 years ago .

The MFD is really just a toy that helps you keep your foot out of it and drive more efficiently. I dont see why it ought to be 100% accurate, as you have a fuel gauge anyway. I doubt that having the MFD read optimistically is a big conspiracy on the part of VW either - only the foolish would ignore a real world calculation often easily done in your head after you fill up against a dashboard gimmick.

Good luck with your application with VWA to have the problem "rectified".

[simonn]

a variation of 20% is a fault.

[Chook47]

For those with an iphone, have a look at Road Trip Lite. You punch in cost/L, number of liters and the Odo. Gives cost and milage with a little graph to compare different fills. And its free.

[yowie]

[QUOTE=gldgti;
Wow, someone dug up this thread! Last post was 2 years ago .

The MFD is really just a toy that helps you keep your foot out of it and drive more efficiently. I dont see why it ought to be 100% accurate, as you have a fuel gauge anyway. I doubt that having the MFD read optimistically is a big conspiracy on the part of VW either - only the foolish would ignore a real world calculation often easily done in your head after you fill up against a dashboard gimmick.

Good luck with your application with VWA to have the problem "rectified".

I think people would like to see their investments treated by VWA a little more seriously than that
We keep a pocket calculator in the door and do our own fuel efficiency calcs. Around town 6.6 so far, and country as low as 5.1 from memory.
i dont keep records, but maybe we should.

[Transporter]

Well unless you precisely measure the fuel that you put in the tank, you can't prove that MFD is inacurate? I know for sure that the pumps are not accurate!

[yowie]

So what is the allowable variation by Trade Practices or Consumer Affairs, Fair Trading in Qld or ACA, for that matter?
Surely nothing like the ten or twenty percent variation above?

[gldgti]

Holy cow.

If the door falls off, if the seatbelt doesnt lock, if the brakes fail, if the engine runs away - all these things are valid concerns. If you are deeply troubled about your instantaneous fuel consumption readout being 5l/100km instead of 6, you might think about some of the things those less fortunate than ourselves have to deal with every day - like finding their next meal, clean water or trying not to get killed. For crying out loud...

Thread closed.