No! Let me put it this way, No! Most of these have been around since the automobile was first invented, but as time goes by they have a new audience. Just keep your tire pressure at the correct level (psi) and drive easy if you want better MPG.
I just filled up today and I got 27.5 mpg, all city driving for me.
I just filled up today and I got 27.5 mpg, all city driving for me.
