I agree, but the whole earth is using that method nowadays. I think in Europe the cars do not have spare tyre for years. And the reason is what you said. Better mileage -> lower emissions. But there is a big problem here up north: the inflation kit doesn't work in freezing cold.Actually it's very American. What can they do to make the car lighter, cost less, and get better mileage, all while raising the price and making a higher profit margin? Seems very capitalistic, aka American.