Quote:
Originally Posted by stillsearching
Wonders what it got at 55mph before treatments for comparison... the previous 5.8mpg average he quotes might've been typically running 75mph type of guys.. any idea what kind of improvements are possible simply through technique on these large vehicles?
I cant wait to see what happens when he closes the truck to trailer gap and sticks something on the rear of the trailer.
The aero improvement is so massive it seems like a must be. :P Whereas modern cars are not too bad off and improvements more marginal (10-15% usually) doubling mileage is pretty mindblowing. Does anyone have a guesttimate of how much it might be possible to improve a full size standard height van? The 6.2 GM diesel powered vans get 22mpg, i'm wondering how feasible 30mpg is with a diesel despite the frontal area ideally with mostly aero treatments. (not slowing down as much if possible)
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If you'll do a SEARCH for the full-boat-tail trailer thread,you'll find some wind tunnel data which I converted to pictorial drag tables.
You can look at what the investigators did,and the numbers it meant.
A 10% drag reduction will give you :
*5% increased mpg at 55-mph
*6% increase at 70 mph.
For speeds in between you can interpolate for a guestimate.
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