I've been noodling numbers on the one-wheeler and it's pretty interesting:
*The T-100's road load is
----------------------- 6 hp @ 30 mph
---------------------- 20 hp @ 50 mph
---------------------- 47 hp @ 70 mph
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*If the load @ 70 is 47 hp
*With a driveline mechanical efficiency of 92%
*The engine is delivering 51.086 bhp @ 70 mph
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*If mpg @70 is 21
*Then your using 3.333 gallons/hour
*And if gas is 6.2-lbs/gallon
*Then your burning 20.666 lbs/hour
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*@ 20.666-lbs/51.086= 0.4045 lb/bhp-hr BSFC
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*Since we know the original drag coefficient,Cd 0.44
*And we estimate frontal area @ 28.925 sq-ft
*We can calculate the original aero hp load at 70 mph @ 29.798 hp
*Subtracting,our remainder is our Rolling Resistance load @ 70-mph @ 17.201 hp.
*At an EPA test weight of 3,800 lbs we can calculate the R-R coefficient for the tires @ Cf= 0.0242 for the set of 4-tires.
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*If the T-100 aero mods and trailer push the mpg up to 28
*Then we're down to 2.5-gallons per hour
*Or,15.5-lbs/hour
*Assuming a constant BSFC we get an engine load of 38.3189 bhp
*Allowing for the driveline losses we get a road load of 35.253 hp
*At say 4000-lbs,our new R-R load is 18.069 hp
*Subtracting that from our total load leaves 17.183 hp aero
*Solving for the new drag coefficient we get Cd 0.253.
*If at a future date we roll the sides in with tumblehome and give edge radii we're looking at Cd 0.232.
*If we 'basjoos' the front wheels we might be looking at Cd 0.192.
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*We haven't added the R-R of the 5th-wheel of the trailer,so the drag coefficient should be adjusted down accordingly.
