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fair enough. Just hoping to optimize this truck for highway speeds as much as possible, lots of long miles getting to wherever I'm offroading/camping/backpacking/climbing etc. Unfortunately the 32" knobby tires, full-size spares, chassis lift, and lots of gear and tools in the back are not negotiable. I'm pretty clear on how to proceed with a belly cover and grill smoothing, but don't want to leave other low-hanging fruit unplucked.
An experiment with a car-top box yielded a 6mpg loss (FAIL). I have it set up now so I can store it in the bed until I get to the trailhead, then move it on top to make sleeping room. The bigger tires yielded about a 1mpg loss (corrected for true distance). If aerodynamics could get that back, I'd be happy. 21mpg at 65 is the best hwy I ever got fully stock (4.0L V6), which already seems much better than the usual off-roading crowd gets.
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