Quote:
Originally Posted by mnmarcus
What? Oh wait a sec. 1 mpg is a 25% increase in FE... Even then, I wonder what numbers you are using???
From Unimog links:
FA (?) 48.18 sq. ft , EE .19, drive train efficiency .9, #2 diesel
CRR (?) .015
Aerodynamic & rolling resistance, power & MPG calculator - EcoModder.com
Gets 13mpg @~37mph... close to 50:50 aero and rolling resistance.
I got 9.36 mpg at 50mph with .75 Cd and a 66:34 aero to rr (respective)ratio. At .30 Cd I got 15.5 mpg, a 65% improvement in mpg and a 44:56 aero to rr ratio.
I stand by the fact that aero improvements are almost always beneficial. Would adding another axle to this vehicle cut rolling resistance by a lot? |
So did I do the math wrong ?
That doesn't surprise me a bit - especially since i was on crismas vacation and using my cell phone to write that.
Isn't .75 - 65% something like .26 though ?
I guessed at 4 mpg. So this monster actually gets better F.E. than several SUVs ?
That's just sad !