They do quite well on gas mileage because they dont take gas,LOL! 
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01' 7.3 4X4 DRK MTLC BLU, DP Tuner F5, AEM Intake, 4" Turboback Silverline Exhaust, BTS VB, AEM digital gauges(pyro, boost controller, trans temp), CCV mod, Rebuilt Injectors, Fuel tank Mods, 203T, 6.0 Trans Cooler, 185,000K and original tranny, so far so good.
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