MPG = Air Resistance vs Speed vs Weight
Improving MPG had me wondering, so I found a definitive calculator to make the math easier. http://ecomodder.com/forum/tool-aero-rolling-resistance.php Vehicle weight [1]: 10,000lb (TV & TT) Crr ...
Forum Discussion
hddecker wrote:
TT 11.5K#s, TV Ram 6.7L Cummins, TT 11.5' high towing at 65MPH over 18K miles, Fuel mileage, 11.75 MPG.
The formula is conservitve, you should have a aerodyanic trailer. A semi is a flat wall (.6), and a 5th wheel has some curves (.5 or even .4).. so it's not perfect unless you put it in a wind-tunnel to know your true drag.
11.5' did you remove 1 foot for road-clearance.
10.5' * 7 wide= ~75ft
Diesel=.3 eff or perhaps .4 with a turbo charger
Lets say your tt has some good curves, 0.4 drag
11.5k lbs weight, with .4 drag
@65 MPH = 10.95 MPG (.3 engine) / 14.6 MPG (.4 engine)
You'll have to tweak the numbers until it fits your rigs MPG, then change your weight and see how little it changes.
