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Thread: Anybody notice better mileage with a cap or tonneau cover?

  1. #1
    Join Date
    Sep 2003
    Location
    Howell, MI
    Posts
    181

    Default Anybody notice better mileage with a cap or tonneau cover?

    I was wondering if anybody noticed better mileage with either, I have a buddy trying to decide to buy a cap or a tonneau and with one if any gives better mileage
    -96 6.5TD K3500 Crew Cab Dually 4x4, 97 cooling mods, Dmax fan, 3.5" downpipe, 4.5" straight exhaust, intercooler, custom intake plenum, fast idle switch, Ranch Hand bumpers, Turbo Master, egt, boost, & trans gauges, 6" Superlift, K&N off the turbo.
    -88 6.2 3/4 burban 255K
    -83 6.2 CC C30 220K
    -82 6.2 1/2 4x4 burban 270K

  2. #2
    Join Date
    Dec 2006
    Location
    Nashville, NC
    Posts
    43

    Default

    Have a Leonard cap and don't notice any difference with or without. I think it's pretty much been determined that the air flow around a pick-up isn't hindered by the bed being open so probably the reason why my mileage didn't change.
    94 K2500, Ram Air, Banks 3" Exhaust, Soot Trap Delete, 3.73 Gears, OPS Bypass, Carter LP, Tank Sock Delete, Lift Pump Pre-filter, Billet Crank Shaft Pulley, Fluidmpr, 91 Gallon RDS Auxiliary Fuel Tank, Dual Relocated Oil Filters

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