I know it sounds counter-intuitive, but it's been proven that you can actually get better gas mileage with a Sprint Booster - depending on how you drive.

If you're a jackrabbit that likes fast take offs and zoom-around passing, nah, this won't help. BUT...

...if you drive moderately, the Sprint Booster allows you get to the speed you desire faster so you waste less gas throttling up. That's because you get a 1:1 ration when accelerating (which is missing in modern cars due to the Drive By Wire design), the movement on your accelerator is smoother.

For example, let's say you are driving a Non-Sprint Booster car and you want to accelerate into traffic. You'll end up pressing your pedal down 50% to reach the speed you want. The bad news is, your Drive By Wire system causes a delay so you press your pedal down further to get up to speed... click here to read more