this is one of the weirdest discussions I've seen in a long time. All this pontificating and formulizing may yield you what?, 5 miles per tank? Do you really want to change your driving habits that much and stress over an extra mpg? Not to mention that your car will be covered in spit if you're the guy driving down the freeway going 40mph holding up traffic just because you want to optimize your fuel economy.

OK, with that said, when I want to optimize my mileage, I don't look too much at the actual speed I'm travelling, I try to minimize my RPM's. For example, when starting from a stop, gather speed gradually rather than punching it. I try to keep my RPM's below 2,800 at all times and it really saves a lot of gas.

But come on, who's really going to drive a $60,000 car down the highway at 55 MPH?