Quote Originally Posted by curtis265 View Post
Wow brenny, thinking deep i see.

I find that if i fill up after 1 week, using almost half the tank (20L), it works out to be less fuel efficient than refilling at the end of 2 weeks (around 40L)

Any explanation for that?
without getting into specifics my guess is that it would depend on quite a few things like how often you'd use your air con..where your driving (ie freeway...start stop) and have you got the same amount weight in the car at all times (except for fuel) and if your going by your fuel gauge as a halfway point ?? cause its never half hahah i find it goes down quicker the lower it gets on mine anyway