Quote:
Originally Posted by Pish
Reset right before you hit the highway.
If you don't reset after every fill up you are not getting an accurate reading since it is including all the prior millage as well.
Eventually after a good amount of miles it will stabilize somewhere if you are on CC or drop if you are going WOT 
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Good to know the long term ave is 29.9 I guess
I reset mine at every fill up too - helps me know when I've been a little too heavy on the gas + it's a good check everything is working as it should (increasing fuel consumption could indicate a problem/need for a service for e.g.)
I see between 9L and 12L/100km or 19-26mpg depending on how I drive.
I've noticed that I see between 12-15L per 100km or down to 15mpg when I am on higher ethanol fuel (e50-e85)... but that's also when I tend to drive a little faster.
Best mileage (highway driving, constant speed) is around 6-7L per 100km or 33-39mpg on normal fuel. On ethanol it actually drops a little and the BEST I've seen was around 5.5L per 100km (42mpg).
Interestingly I have also had some bad mileage since fitting a full exhaust... cos you know... you need to hear it a bit more often