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Re: O/T Fuel Mileage (empty)
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Posted by Pete in Holland, MI on July 29, 2005 at 07:19:37 from (198.36.89.4):
In Reply to: O/T Fuel Mileage (empty) posted by Nat on July 28, 2005 at 18:23:04:
Mileage is obviously impacted on how you drive. Mileage is also impacted by the amount of wind that you break. Trucks are not very aerodynamic. The big tough exteriors that we crave are like parachutes going down the road. Ever ride a Schwinn Air-dyne exercise bike? The faster you go, the more energy it takes. My 03 4x4 Sierra with the 5.3 V-8 has the on-board tip computer, which is a lot of fun to play with. It shows on my truck that keeping the road speed below 65 mph, I can encroach on 21 mpg on flat ground on a relatively calm day. 70 & above (which included bucking head winds), it drops to 15-17 mpg. Caps also suck mileage by about 1.5 mpg at highway speeds. Tannoe covers are the better solution. Tailgtes down or off make little difference. It's the blunt back-end generated by the cap, especially those with elevated rear ends, that causes a vacuum going down the road. Look at an airplane. The trailing edges are never blunt, but feather to a thin edge. Something else to scare you is that the internal combustion engine is hardly 20% efficient, meaning around 80% of your fuel dollar is leaving the engine in lost heat.
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