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Welcome RAV4. I believe your are using the template correctly. It can be impractical for normal road going vehicles. Despite all the other mods that I have done to the Golf TDi this one is still in the dreaming stage. Most of the ones you will see on this site are done on pickups or small vehicles that already have half of the boat tail built into the car, like the gen 1 Insight. How much of your driving is highway/high speed? You may see zero benefit in town driving or even lose mpg-e due to increased weight. Many users report better handling at high speeds with a boat tail or Kamm cover. If you search for "phantom boat tail" you should find some data Phil has provided about the benefit of an 80% boat tail having nearly the same Cd as a full length one.
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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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