Fuel Economy in the Summer

Did you know that hot weather can actually increase your fuel economy? There are several factors as to how this happens. One is that your engine warms up faster, since it is already rather warm when you start it. Also, summer grades of gasoline are slightly better and have more energy. Another advantage is that warm air causes less aerodynamic drag than cooler air.

However, there are common practices that can reduce fuel economy as well. One such practice is running the air conditioning. This is the main contributor to reduced fuel economy. Under very hot temperatures, the AC can reduce a normal vehicle’s fuel economy by more than 25%. The effect on hybrids and electric vehicles can be an even larger percentage. Another way that may contribute to reduced fuel economy is driving with your windows down. Open windows can increase wind resistance, which causes your vehicle to use more energy to push through. While it may not be noticeable at first, once you reach highway speeds, this can increase dramatically.

So, what are things you can do to improve fuel economy in hot weather? Below is a list of possibilities to help combat the things that may be draining your fuel tank.

• Don’t use the AC more than needed.
• Park in the shade whenever possible so the cabin doesn’t heat up as much.
• Drive with the windows down for a short time before turning on the AC. Letting the pent up hot air out first will reduce the energy needed to cool down the cabin.
• Most AC systems will cool the vehicle faster if you are driving, so don’t sit in idle with the AC running.
• Roll down the windows during low speeds and use the AC on the highway.

By following a few of these simple instructions, you can help your fuel economy from slipping too far off the mark during the warmer summer months. Help your trip by being able to avoid frequent stops at the gas station!

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