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Greensboro Auto Service - How to Fix the Issue of Poor Fuel Efficiency in Your Volkswagen - A car with gas mileage might incur unexpected costs. There are a lot of factors that contribute to decreased fuel efficiency. One of the most common causes for this problem is clogged or defective gasoline injectors that prevent the fuel from making way into the engine in right amount. Other variables include driving habits and circumstances, faulty spark plugs, insufficient oxygen circulation in the engine, leading to poor fuel efficiency.