... Do you think we have tapped all the energy available in a drop of gas? I'm far from an engineer but I have heard that for every 100 lbs you remove from a vehicle you gain about 5 hp which would probably get you more MPH. So all the car companies have to do now is lighten the cars without sacrificing safety, correct??.. BTW, at what speed do they test vehicles to come up with the gas mileage ratings on the window sticker??