As I was saying before I rudely pressed the wrong button!
Although other drivers treat you differently, I remember that I used to get about 25MPG, and if I put my foot down in anger this reduced.
So now I get the last laugh when Pick-Up's and SUV's pass me in anger, as I know that it cost them a gallon jsut to vent their frustration!
It's all good fun in the end, and the Prius is pretty safe anyway.
So do you drive differently in the Prius vs. the Mercedes? Because in the big truck I just roll along, slow down early, and basically don't worry about people behind me rear-ending me, but when I drove a car it was like "should I slam on the brakes and corner on two wheels or start slowing down 1/2 mile out so the yahoos behind me don't hit me?"