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Old 11-02-2012, 08:18 AM   #8 (permalink)
Master EcoModder
Diesel_Dave's Avatar
Join Date: May 2011
Location: Indiana
Posts: 1,194

White Whale - '07 Dodge Ram 2500 ST Quad Cab 2wd, short bed
Team Cummins
90 day: 37.68 mpg (US)
Thanks: 112
Thanked 507 Times in 211 Posts
DirtyTorquer, you're on to the root of this.

Work output of the powertrain necessarily increases with speed because the aero drag is increasing with the square on speed. So for your mpg to get better at higher speed, something about the powertrain operation has to change to allow you to produce more work that you were before with less fuel than you were before. I.e. if the higher speed means you need X% more work output, the powertrain needs to have become >X% more efficient. That scenario is possible, but pretty rare.
Diesel Dave

My version of energy storage is called "momentum".
My version of regenerative braking is called "bump starting".

1 Year Avg (Every Mile Traveled) = 47.8 mpg

BEST TANK: 2,009.6 mi on 35 gal (57.42 mpg):

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