Going 55 might bring out the road rage. Do that factor that stat?
I do get some awfully dirty looks...
When I have to drive my truck to work instead of my motorcycle, I set the cruise control @60 mph. My mileage went from about 375 miles per tank to over 500. The savings is significant, especially when it comes time to fill up that 25 gallon tank. But this is MY choice.
If there was a 55 mph law, I would probably crank it back up to 75, just on principle.