[jedi_sol]

Originally Posted by Daox

You set a specific route. That route should eliminate as many variables as possible. This usually means finding a quiet country road that has a decent speed limit.

Seriously, it is a good read:
http://ecomodder.com/forum/showthrea...ery-11445.html

Even if there is a gradient in your route, you should do runs in both directions to average out the difference in the gradient.