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Funny about the Silverado since I will be pulling a 13K lb RV with my turbo-diesel pickup and working to get the best fuel mileage I can (air deflectors, bed cover mods, modification of hitch pinbox closer to truck cab, etc.). Have already modified the truck and getting at least 20% better fuel mileage when not pulling by lowering it and adding an extended lower air dam, bed cover, turbo inlet mods and lower restriction air filter with cool air intake and computer tweaks.
2005 GMC 2500HD turbo-diesel RWD, lowered 3", 4x4 air dam, trifold tonneau
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