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At 50,000 miles a yr avg mpg 6. 1/4 mile increase. $3 diesel. You'd get your $400 back in 5 months, then you be rollin in extra cash you can waste invest in drugs, women, and sand toys!! See Fabr, your lookin at it all wrong.
So ,are you saying that the aero drag being reduced should "add" HP to my rig?Ya,I know,not really adding any HP but rather freeing up HP to help power me up hills/long grades? If so , would the performance increase be noticable in your opinion pulling long grades where I either lose 15mph or even have to downshift? My toter/trailer is basically a baby semi@70ish foot long depending on which trailer I pull.2-3 foot shorter height .