Quote Originally Posted by Bludger View Post
no its not.

car burns more fuel in last half cos fuel is dirtier.
please explain. Why is it dirtier, and why does it burn more?

I always check my fuel economy and if I fill up at half tank or fill up when the tank is close to empty, I have the same fuel economy reading. This makes your statement hard to believe. Inaccurate indicator would be more plausible. Correct me if I'm wrong.