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Sepp,
'Glad to hear of your better coasting with the curved cap. On a slightly off-topic note: newer fuel injected cars completely cut-off the fuel supply while engine braking in gear. Depending on how new your truck is you may get better fuel economy leaving the truck in gear down a hill if you have to stop or slow down at the bottom. (You can test you vehicle by driving down a gentle hill in gear with the window down and see if you can hear the engine quit firing)
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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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