TL;DR
Allow vehicles to draw power from an equipment gridWhat ?
It would be nice to use a vehicles engine power for its equipment grid, rather than have a fusion reactor for equipment and a coal fired engine for motion. This has been suggested before viewtopic.php?f=6&t=31616More interesting solution would be to power the vehicle from an equipment grid. This would let you chose an arbitrary energy source and allow a vehicle to be upgraded through parts
A new equipment type that exports motive force separately to electrical energy would be ideal. Burner engine with an alternator produce motor power and some electrical power, and electric engines that turn grid power into motive force. Fuel bonuses would work as they are now, but electrical engines would need their own system, perhaps stacking them would provide a similar bonus
Most likely possible with a mod, moving energy from the grid into its vehicle every tick seems doable, though not ideal