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Old 06-14-2010, 07:32 PM   #11
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Quote:
Originally Posted by GXP Venom View Post
Ya, when you move forward, the wind over the cab isn't really disrupted by the box. Covered or not, tailgate up or down, trucks have a blunt front end and little slant to windshield. the wind is still on an upward travel as it goes by the box. I have a heavy topper for my Ram3500 thats even with the roofline. Makes it looks like a dually version of the Ramcharger. I always figured I would get better mileage with it on. When I actually checked, it got worse mileage with the topper on. I assume because of it'* weight.

Our "other" car is the wife'* Prius. It gets 50/52 MPG off highway where the hybrid system can work, 44 MPG on the highway. No mods, LOL. But I have been thinking of how much better MPG I could get with an additional battery from a wrecked one fitted into the spare tire area would bring. The system brings the one to a full charge easily in our hilly area, and I bet additional storage would give some appreciable better MPG'*.
This has actually been proven to have an effect MPG. With the tailgate up a "bubble" forms that allows "new" air to pass right over and increses mileage. With the tailgate down there is no "bubble" so the air goes over the cab, then down into the bed and creates force and drag. That reduces mileage.
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Old 06-14-2010, 11:03 PM   #12
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So it works opposite of standard rationale. It all pretty much N/A to me. I seldom drive the truck empty, it always has either an 8600 Lb boat and trailer hooked to it or logs stacked as high as the cab. No wasting it for trips for groceries for me.
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Old 06-14-2010, 11:28 PM   #13
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Right on
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Old 06-15-2010, 02:07 PM   #14
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88' fullsize 4x4 Chevy pickup...changed to 3.73 gears and opened up the exhaust...headers in the future... mileage has remained at 16 city 20 hwy...but i have more power, whatever its kinda ugly and way to tall for the garage but it'* detroit locked and does everything i ask including pulling brand new one wheel wonders out of the ditches in the winter lol
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Old 06-15-2010, 02:49 PM   #15
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i know its a gm but oh well my 93 silverado ext cab short bed 4wd 355 sb throttle body injection gets 17 mpg highway ....if i can keep my foot off the floor..yeah right
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