Originally Posted by wayne71
I'm puzzled by mine, OBC shows between 33-36 mpg (mainly town driving), when I fill it up it shows between 450 to 480 on the range which I presume it works out from your average mpg yet I'm only actually getting around 350 miles a tank recently?
Its remapped and I've often wondered if the software is rigged to show a better mpg than its actually doing.
The distance (miles remaining) part, is a rolling calculation, based on the mpg you are doing at the time. So you could fill when your car is on a higher figure, and is not representative of your average mpg.
I'm aware some remaps/boxes seem to mess the OBC accuracy.