So first let’s get a baseline for a few things,
What kind of wheels are you intending to use for this?
Hub motors - cheap, compact, very efficient, motor is inside the wheel, sucks terribly for comfort, poor reliability in many cases, and it’s effectively impossible to go off-road with hub motors.
90-110mm urethane - less efficient, less compact, more expensive, substantially more comfortable, a little bit of “off-road” can be done if it’s well packed and the rider has a bit of skill.
Sr125 rubber wheels - less efficient, less compact, more expensive, substantially more comfortable, Opens up more off-road capability than urethane wheels.
6-8in pneumatics - even less efficient, even less compact, similar or sometimes lower cost to SR125 wheels, more comfort and can generally handle most off-road other than deep sand/mud/snow.
I’m also going to provide some efficiency examples I’m ~180lbs
My backfire zealot uses 105mm urathane wheels and belt drives, that board uses between 19-24wh/mile
My Hummieovan uses about 25-30wh/mile
My McBoardface uses between 28-40wh/mile
But I ride that more aggressively than anything else.
@Pecos Blue Koi uses hub motors, what does blue Koi consume per mile?
(I recall this being very efficient)
IMO you can build an efficient compact, flight safe board or you can build a powerful, fast, off-road capable board, it’d be incredibly difficult to do both.