Game about vehicles is sandbox physics construction game, focus on building and testing land, sea and air vehicles. Vehicles can be any shape, each modules can be fully customisable and it changing physics behaviour.
Now in screen bottom right is fuel level indicator. Wheels, joints, propellers need combustion engine to work, combustion and rocket engines need fuel, each tank node give some space to maximum volume of fuel storage. Next version will don't have torque connectors, torque transfer will be automatic.