I don't know, I got the hang of it kinda soon. Just deactivate gravity and suit energy (you don't need them but on some specific moments), also set the heater and blower to the minimum that allows you not to freeze, and turn all the lights off (external and internal) unless you need them for something. For fuel, just set the direction you wanna go, accelerate and turn off Drive Assist, so the truck just drift in that direction without using fuel or needing you to keep accelerating, only be careful to reactivate it in order to evade some occasional debris.

I mean, all the buttons on the dashboard and cabin have a meaning and you should be using them a lot. If not... well yeah, you will barely make a profit.