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Sparkchaser, Welcome to Ecomodder. If you do some reading on this site you will find the biggest aerodynamic gains come at the back of the vehicle. It's kinda counter-intuitive. Many pick-up drivers here have used an aero bedcover with good result. The Dodge Ram has huge fender openings so it may help to close those up a bit. I have seem improved mileage with a belly pan on my vehicle but a 4x4 may be more challenging. Do you ever go off road? Do big axles and suspension disrupt under-body airflow. I would start with an aerocap and grillblock first.
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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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