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Re: bad gas mileage.....need some help.......
What engine do you have?
The 5.9l is known for the lifter valley/intake gasket leaking and causing the Intake manifold to get too warm, reducing performance and mileage. My mileage has gone down some b/c about 1/2 of the stations in my area have 10% Alcohol added to the fuel (90% gas) for the winte months. When I use this stuff my mileage drops 10-15%.
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