[Walt34]

Much of what the hypermilers do is too risky for my tastes. Drafting behind a large truck does work, but what is a minor bump to it can be catastrophic to even a large car - think deer carcass or muffler on the road. Staying that close behind gives you no reaction time. A second of inattention at the same time the truck brakes hard and you have the back of the truck literally in your face.

High tire pressures affect handling and reduces the "footprint" of the tire on the road to just the center section and will increase stopping distances. No deal for me.

So I just keep up with the maintenance, keep clean air filters in place, and drive with an awareness that every time I touch the brake it is "throwing away" expensive momentum.

Keeping the vehicles very clean makes some difference, the faster one drives the more it matters. When I had an airplane that cruised at 120 mph washing it would increase speed by 5 mph.