I was able for the first time average over 60 mpg on a trip yesterday (50 miles each way)!

Anyway, I am wondering if anyone has any tips on the best drafting techniques behind trucks. I've heard different things about how far back one needs to be. I know it'll probably depend on the speed and how big the truck is. In general, I find if I'm two-three car lengths behind it seems to make a difference but it's hard to quantify since the roads around here have slight grades on them and it's hard to tell if the MPG differences are road or air related. Anyway, I would appreciate any insights that people have regarding the best way to increase mileage!

thanks,

Aspenboy