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FWIW, I recently added a Jeep Grand Cherokee CRD to the fleet. Based on my encouraging results with the VW I will probably get a Green Diesel Eco tune in the near future. From their website- "Available power is increased to 250hp and the torque is also increased along with a broader torque curve.
Fuel economy is increased by 2-4mpg.
EGR is eliminated and turbo lag is reduced significantly.
The swirl motor is turned off and no CEL if the motor has a failure (common problem on this application)". Marketing, not science, however I will update if I notice any improvement. I am doing this for long term reliability and to avoid a potentially costly repair
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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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