Hi
In response to bwilson; I can only say that now I have a probable explanation as to why I got such incredible gas mileage on my recent cross-country trip: cruising along in the wake of trucks. It requires that one pay quite a bit more attention to what's in front of you, but hey, saving $$ and creating less of a carbon footprint is worth it, right? I don't understand the physics of aerodynamics, but it works!!