Quote:
Originally Posted by HighwayPrisoner
7.3 PSD can pass all the gas pumps, but prefers good quality Diesel fuel. The driver is the most important for good fuel mileage. Driving, and weather conditions are a close second. An improved air intake like a Ford AIS, a less restrictive exhaust system, tire pressures, and a good econo tune can help, once the cost of the mods are recouped. Lift kits, and big rubbers definately hurt economy.
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Where and how would i tell if its quality diesel?
