Although Audi quoted similar mpg figures for both the TDI 75 and 90 variants in the real world and having owned numerous 75's and a couple of 90's the difference in mpg is huge BUT in favour of the 75 like 99.9% of people who have owned them will agree and by around 8-10 mpg from my experience.
To average 78mpg in either of my 90's i would have needed to be going downhill with the clutch depressed
Mpg in the 50's is pretty much the norm for a 90 and 60's for a 75.
These figures are obviously dependant on everything being in tip top order and working as they should. No binding rear brakes, under pressure tyres and faulty temp sender/thermostats
Here is 20k of travelling I tracked before getting bored of filling in the app
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