Tip 2: Swapping vehicles

Soldiers cannot use Medikits to refill their health bar while occupying a vehicle, and exiting the vehicle ends a soldier's turn, but if there is an unoccupied vehicle nearby there is a sneaky way to refill your health and remain in a vehicle.

The exit vehicle command works the same as a jump. Drive your soldier's vehicle up to the unoccupied vehicle, then exit the current vehicle by jumping into the unoccupied one. This will end the turn, but the soldier's health bar will automatically be filled by the new vehicle!