... only the petrol heads get that. Meaning that you might already have the best software for your car.
well, my 2002 dci does have the full computer setup.
It didn't when I bought it, but a friendly Renault mechanic said, "oh, we'll enable that" and that was it.
I agree with Anders that the accuracy is poor, but it is certainly not useless.
The real-time measurement is a VERY good tool to hit you over the head, everytime you forget you had an intention of doing good mpg on this tankfull ...
The accuracy
is appauling, but constant, - the dash-computer in my car gets it about 17% wrong - surprisingly to the pessimistic side. One could have expected that they did it to impress new customers. so a reading of 9.5 l/100km is in fact 8, when I do the math after filling up. (our car only does very short trips)
I'm convinced the reason so many modern fuel-economic cars have such an appauling accuracy of their speedos, - is that it will make people drive around at 53mpg when they think they do 60, and
then the consumptiuon figures match the brochures...