1. Shift to Neutral When Stopped.
Notice that shifting your automatic or manual transmission into neutral calms down your engine note and drops the rpm. That saves gas. Shift into neutral even for a long traffic light.
2. Don't Rev the Engine Before Shutting Off the Ignition
Many of us learned to do this on carburetor-equipped engines in the belief that stomping the gas pedal as we turned off the switch would "prime" the carb (put a jolt of gasoline in its bowl). Most of the time, it did little or no good even for a carbureted engine.
For today's fuel-injected engines, it's a complete waste of fuel. Not only that, but the final spurt of gasoline also winds up dumped on the cylinder walls where it can wash away the essential lubricant, paving the way for increased wear.