Weak inflated tire rolling process continuously, and this energy is spent-derived, of course, out of fuel. If there it is inflated tight as a drum, a tire will save you I 55 ml fuel per hundred kilometers. Or maybe even 100. However, pressurized cabin as a drum lid completely loses ability to amortize that you immediately identify shocks in their own headquarters. In addition, the tighter the smaller wheel is inflated by a slick tread contact with the road and the worse grip.