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Thanks guys for all your responses. I am trying to make the best informed decision and I appreciate all your viewpoints. Nacht, environmental concerns are one of my considerations. (most days I do not start my car and commute by bicycle even down to 20 below zero). On the other hand, I live in a sparsely populated area surrounded by three coal fired power plants. My NOx contribution would be minimal from a 50 mpg vehicle that I barely drive.
VWs are prone to manifold clogging ($300 repair- the manifold must be removed or replaced), cracked EGR tubes (I'm on my second set- $300 in parts alone), clogged EGR coolers, and sticking/clogged EGR valves making the vehicle run poorly.
My original post was to ask how it affects primarily highway mpg? Keep those comments on efficiency coming!
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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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