Grav Vehicles, Grav Drives

[Grav_Moped]

(Split off from Reentry and landing)

Some issues:
How does the Grav Drive work (in terms of technobabble and in-universe capability)?
Does it imply artificial gravity?
Does it imply (or can it be repurposed) into some sort of reactionless thruster mechanism (if only at higher TLs)?
Does it (as implemented in the game) break conservation of energy in the same way that Maneuver Drives do (less energy input than output)?

I'm coming at this from CT '81 and Striker, since that's what I have on hand. Inputs from other versions are welcomed.
Seeking canon descriptions of examples, capability, and in-universe explanations.

For RPG purposes, "It's a flying car that can carry X passengers, Y tons of cargo, and go Z kph because it's narratively convenient" is perfectly adequate. I'm just trying to explore the implications of the canon description of their capabilities.

More to follow as time permits.