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Q: Bad fuel mileage on 2001 Ford F-350 Super Duty

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
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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