Unrelated but fun fact: some heavy duty air-brake trucks can also use compressed air to start the engine, but what if your tank is flat? You can hook up one of

Unrelated but fun fact: some heavy duty air-brake trucks can also use compressed air to start the engine, but what if your tank is flat? You can hook up one of the tires and use that to start the engine! Really neat. Also, many trucks have both an electric starter and an air starter. I one day aspire to those kind of redundancies in a vehicle I own.