1. Tune-up, Clean Filters, and Properly Gapped Spark Plugs

The day your vehicle left the showroom, was probably the best fuel economy it will ever see. This is because as an engines wears, it becomes less efficient overall. In order to maintain that original efficiency as much as possible, you need to maintain and change your vehicles oil, filters, spark plugs (properly gapped), spark plug wires (if you still got them), and keep the engine in proper tune. An engine in poor tune can lose as much as 20 percent of its original efficiency. This is why the first step to any project aimed at improving fuel consumption, should be to restore the engine back to its original state