Warm Up Your Car for Shorter Lengths of Time
If you wake up to a cold morning, don’t warm up the car for longer than 30 seconds (up to one minute if you must). If you idle the engine for more than a minute, you waste fuel and pump nasty greenhouse gas emissions into the air. Engines of modern cars do not require the extensive length of time that older models needed to warm up.

Slow Down and Drive Steady
Driving fast may be fun, but it also increases drag, which increases fuel consumption. Driving just below the speed limit and driving smoothly (not accelerating quickly) uses gas more efficiently, so you may have to fill up a lot less often.

Don’t Wait Until Your Tank Is Almost Empty to Fill Up
If you wait until your tank is almost empty, you may be stuck paying for whatever gas you find conveniently nearby, as you won’t be able to search for the best deal.