This video gives a rundown on three of the most effective things you can do to improve your fuel economy. First and most important is your driving habits. Aggressive driving, idling, repeated slowing down and speeding up and plain old speeding will cause gas mileage to plummet. Second up is tire pressure and wheel alignment. Under inflated tires or a misalignment will generate extra friction your engine will have to spend gasoline on fighting. And lastly, maintaining your engine in good shape with tuneups will keep it in top efficiency.