There are laws of physics that play...but there is one that is a holy grail of
MPG...all ICE's play in the 20%-40% efficiency. That 40% is s 2cycle diesel, which
will be tough to find in a TV
Towing whatever at some speed will take X amount of fuel factored
by other factors. Like the aerodynamics, how high off the ground,
how efficient the tires are, etc, etc
Why some small blocks towing the same trailer on the same roads and
'similar' speeds (they can't as fast as I can) gets the same and
some times less than my big block towing that exact same trailer. My
Sub weighs in around 7.4K with just me in it and some of those small
block TV's weigh less, but again still get similar or less MPG
It is typically NOT the engine that limits, but the rest of the vehicle...the
body in a monocoque and the frame in a ladder frame with a monocoque sitting on it setup
My 1970 2 seater sports rocket has a Class I tow hitch. Gets 31 MPG if I'm not
on it and on the flats (in-line six...2.4L) and have towed: Lawn spiker, lawn
rototiller, concrete mixer, and a small utility trailer (12" dia wheels)
I'd not tow a pop=up with that 2 seater. All the stuff above were in the 200-500
lb range
PS....that 2.4L goes into the 12-15 MPG range when I'm on it :)
