Well I suppose the way to save the most on gas would be to not own a car. If you do chose to own one however and wish to save on gas, do what I do. I walk allot and leave the car at home. If I do bring it with me, I tend to park it and walk to nearby stores. I shut the motor off at train crossings as well, and I shut it off while waiting for someone I am giving a ride to. Oh yes, I also coast downhill with my foot off the gas pedel.