Thinking ahead when running errands can help you save not just time, but money at the gas pump. When you take a trip to the store and start your car when it’s cold each time, it can use twice as much fuel as if you made several trips doing back-to-back errands when the engine is still warm. Planning multiple errands also reduces the total distance you need to drive, so you save a significant amount of money and time in the long run. While you’re at it, drive the speed limit. For every 5 miles over 50 miles per hour, it reduces your car’s efficiency to the tune of 24 cents per gallon of gas.