Towing with an EV.
8x11 box, Cd=.6 (like semi)
MPH MPGe

No trailer:
35 247
55 167
70 123

5000 lb trailer
35 66
55 33.6
70 22.1

aero drag key, not weight.

Range ratios
247/66 = 3.74
167/33.6 =4.9
123/22.1=5.56

300 miles goes to:
80 at 35 mph,
61 at 55 mph
54 at 70 mph
Dodge ram is 32 mph HW, ~16 mpg towing. 23 gal usable, x 32= 736.../2=368

Drop is 50% in range towing for Diesel. 736 to 368

Drop in range for EV is 82%, 300 to ~54.

Cyber truck, 500 miles goes to ~90 miles.

368/90= ~4x more range Dodge/Tesla.

https://www.ramtrucks.com/ecodiesel.html 
Why the larger drop in EV and not Dodge Diesel?

Towing at 16 mpg is 42% eff (engine worked hard).

Should be 5.56x16=89 if 72% like EV, but is 42%=52 mpg.

Dodge should be 52 mpg if 42%.
32/52 x 42%= 26% highway, no trailer load.

EV remains nearly CONSTANT in efficiency.
Diesels drop 50% in range and EV 82%. 2 vs 5.56 factor.

5.56/2= 2.78.

EV needs 2.78 more range than Diesel based on no tow range.

Tesla cyber truck needs 2046 miles /5.56=368 to get Dodge tow range,

or ~4x more than planned Cyber truck. Fail. Battery too heavy!
Dodge Ram at 5200 lbs, has a flat plate drag of ~17.7 and a with efficiency of 42% and you would show:
no trailer
MPG MPH
99 35
54 55
41 65
36 70 .

5000 lbs trailer, 8x11 high. .6 Cd, 52.8 FPD
MPG MPH
39 35
20 55
16 65 (notice this is often quoted by people)
13 70
Ratios!

99/39=2.54
54/20=2.70
41/16= 2.56
36/13=2.76

Notice that a Tesla at 5.5 Sq Feet drag vs 17.7 for the Dodge shows a huge jump in aero drag compared to Dodge Ram Pickup.

52.8/17.7=2.98
52.8/5.5=9.6

9.6/2.98=3.22

Hence the very large drop in mpg in EV vs an old pickup.
Aero drag reduction is key for constant efficiency vehicles like mine and EV.

This is why ACTIVE DRAG REDUCTION on the trailer is key to MPG when towing.

I can see a trailer with 10 sq ft drag and 72 mpg at 65 mph. vs 16 now with Diesel or 28 with EV.

72/16=4.5
72/28=2.6
With a new low drag "car" (part of roadable airplane body) and new trailer, I can see 7.5 sq ft drag, .16 Cd. 10,000 lbs total weight for a trailer that folds out to 400 sq ft of living space.

Both would get 100 mpg at 60 mph.
The car would get 250 mpg without trailer at 60 mph.
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