High Altitude Gladiator for highway use?

ShadowsPapa

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Bill
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Runnells, Iowa
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You are pushing a brick through the air - and now, a slightly taller, heavier brick.
Wind resistance, to put it most simply, increases exponentially, studies from the 70s found the biggest savings was found by keeping highway speeds down 60 and above you really start to notice the loss ramp up, 60 and under you see fair savings. I've noticed mine, well, even my Silverado, lost the most MPG when I pushed above 65. 55-65 I got decent mileage.
I'm not advocating you drop down to 55 LOL - just explaining why your mpg sucks.
It's not a straight ramp as far as loss - the faster you go, the more the loss accelerates.
Frankly I'd see 17 as decent at your speeds. 80 is a killer for mpg.
And it's going to be worse with that added height or frontage.
Dunno know where you live - maybe you'd get killed going slower than 75 - but for kicks, try 75 or lower just once and see what a difference it makes. (I've heard parts of Florida they revoke your life insurance for driving under 80 LOL)

 

 
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