Determine how much you'll save by replacing your gas guzzler with a more fuel-efficient car.
Edmunds.com tested out popular gas-saving tips and found the most effective:
Slow down acceleration time (accelerate 0 to 60 mph in 15 seconds). Average improvement in fuel economy: 31% (highest: 37%)
Drive the speed limit. Average savings: 12% (highest: 14%). In general, optimum miles per gallon are found at 35-45 mph.
Use cruise control (unless driving in a mountainous area). Average savings: 7% (highest: 14%)
Shut down car if idling for more than 1 minute. Savings up to 14%
Keep tires inflated to recommended levels. Savings varied but, in general, gas mileage decreases by 1% per pound below recommended tire pressure.
Turning off A/C and opening sunroof. Minimal savings, but could vary by vehicle. (Note: they found no difference if the A/C was turned off and the windows were rolled down because of the increased drag on the car).
Refuel your vehicle during the evening hours to reduce the amount of pollution created.