How to Improve Fuel Mileage in a V-8 Jeep Grand Cherokee
The fuel mileage on a V-8 Jeep Grand Cherokee is an estimate 13 miles per gallon (mpg) in city driving and 18 mpg on the highway. The engine is large, the vehicle is heavy, and both of these obstacles are hard to overcome. You may never match the fuel mileage achieved by Jeep's smaller vehicles, such as the Liberty or Wrangler, but you can take steps to improve on your current average miles per gallon.
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Instructions
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Change your driving behavior. Drive the speed limit. When you slow down, your Jeep's V-8 engine turns at fewer revolutions per minute (rpm). This means the engine takes less gas to maintain the speed you are driving. If equipped, use cruise control on highways. Steady speeds reduce inadvertent engine revving caused by your foot on the gas pedal. When you are parked, shut off your engine. You will likely see the highest improvements in your mpg by adopting these driving behaviors.
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Maintain proper tire inflation. The Jeep Grand Cherokee stock tires should be inflated at 38 pounds of pressure on the front and rear tires. Anything less than 38 pounds increases the tire surface on the pavement. This creates more "drag" and causes the engine to work harder to maintain speed. This increases the nominal rpm range and increases fuel consumption. Tires tend to lose air during the colder months. During the winter, check your tires weekly with a pressure gauge.
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Lighten your load by removing anything from the storage areas that you do not need to carry. Every extra 100 pounds you carry can decrease your fuel economy by 2 percent. Given the large storage capacity of the Grand Cherokee, owners tend to carry several hundred pounds of material.
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Maintain your vehicle regularly. Surpassing 3,000 miles for an oil change causes the oil to become thicker. Thicker oil creates more drag on the engine's internal parts and causes the engine to work harder. This decreases your gas mileage. Along with this, complete routine engine tuneups every 50,000 miles, changing the spark plugs, spark plug wires and the distributor cap. With fresh plugs, wires and distributor cap, the engine will burn fuel as efficiently as possible.
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