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2001 Ford F-350 Super Duty Question: Bad fuel mileage



aggieland3136, 7.3L V8 Diesel Turbo, Midlothian, TX, June 22, 2011, 18:09

I was getting around 500 miles to a 38 gallon tank will normal city and highway driving until 2 weeks ago.My last 2 tanks of diesel I'm now avg. around 400 to a tank. what could be the problem.

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