Not sure where you heard this but what'll happen is you'll end up wearing our your brake pads and rotors. Not good. If you want to conserve gas, drive conservatively. That means no quick starts or tail gating.What is the best way to save on gas? I heard a rumor that if you ride the break, you use up less gas than you would if you come to a complete stop. At this point, with these prices, I'm willing to try just about anything.