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Diesel Power Magazine has tested 2, and improved mileage with both of them. Do you believe they are untruthful?
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2002 F350 CC, SB XLT 6spd, Luk clutch, 285/75R16 Goodyear Wrangler Silent Armor
4" Magnaflow Turbo Back Exhaust
DP Tuner: 80econo, 60econo, 40tow high Idle
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