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If you have instantaneous fuel economy readings on your onboard computer, it is possible to do it on a flat stretch of road. Warm up the truck, drive between 2 landmarks using cruise control at a constant speed. Leave the truck running and cruise "on" between runs. Disengage cruise by tapping the brake. It is best to do both directions in light traffic and no wind if possible. Remove Kamm, repeat. Replace Kamm, repeat. It takes some time to get accurate results and higher speeds will show bigger differences in Aero mods.
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60 mpg hwy highest, 50+mpg lifetime
TDi=fast frugal fun 
https://ecomodder.com/forum/showthre...tml#post621801
Quote:
Originally Posted by freebeard
The power needed to push an object through a fluid increases as the cube of the velocity. Mechanical friction increases as the square, so increasing speed requires progressively more power.
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