● Gasoline is hitting record prices, so every little action you can take to be as fuel-efficient as possible helps. The easiest way to improve efficiency by as much as 20%? Drive the posted speed limit. Driving faster doesn't typically get you where you're going any sooner, and riding the gas pedal wastes a lot of fuel. Also, if you do need to accelerate to, say, pass a car, avoid flooring it to c…