Quote Originally Posted by oj88 View Post
True, but I'm sure that a lot of motorists would still prefer driving on smooth blacktops rather than on hard concrete, even if it means spending a tiny bit more on gas. The former is also easier on the suspension.

With thousands of miles of interstate highways, the effect of road hardness on fuel economy would probably be more significant in countries like the US.
Well... concrete isn't necessarily harsher than asphalt. At least, as long as there are no bumps, it's not easily noticeable.

And asphalt is a pain in the ass. Melts in the rain too easily... as motor oils and solvents mix into it.