another thing i do is coast.
i do a lot of coasting.
me and the kids even have a game for it, to see how far i can coast.
as for drafting, i do see an incredible increase in gas mileage just being 30 feet away. i don't get all stupid and try to draft 5 feet away from a semi.
here are some simple stats about drafting.
http://green.autoblog.com/2007/10/28...-improve-mile/