sometimes i have to check to see if this really is a bike forum.
i have started driving slower. i live in rural texas and the speed limits here are 70mph on secondary roads. i started going 55mph a few weeks ago. the berms are wide enough that when a car comes up to pass me i can move over very safely, and usually flat enough that i can see someone coming a ways off, and also see what's in front of me. it works well for me. i know it doesn't affect the world's use of gas, but i get better mileage and i'm surprised how much less stressful driving is. i'd suggest that others try it. when i'm on the freeway, i try to go 65, but that's usualy 15-20 mph slower than the rest of the cars/trucks/ and suv's so it's not very practical. if anything, it really makes me aware how fast people drive and that i really prefer not to be on the freeways. you'd get killed going 55mph and with trucks running you down, it's impossible and dangerous. but if everyone did it, it would work, it would save gas and reduce stress and road rage. but we won't.
i just try to do what i can do, and slowing down is simple enough.