While there are no fuel saving tips that will keep your car full of gas without filling up, there are some tips that really can help you save money on fuel over the long run. Fuel Efficiency Tip #1 Turn Off Your Car If you are going to be stopping for more than 10 minutes you should switch off your car to keep fuel efficiency at its peak and not burn more gas than is necessary. Fuel Efficiency Tip #2 Don't Turn Off Your Car If you are only stopping for a brief moment or less than 5 minutes then don't turn off your car because the amount of gas used to crank up is more than you would burn in that short period of time.