Bit of a pointless exercise. As others have pointed out, the airliner can take you between destinations where the auto is impractical (for instance, to the US from the UK, to Japan from anywhere). But the auto takes you places where the airliner can't, for instance from the drome to the home. For real accuracy, you would have to factor in the travel door-to-door.
Fuel efficiency is a losing argument. After all, peak fuel efficiency was achieved in the clipper ships of the 1850s. The only fuel they used was a bit of whale oil to light the lamps. Yet improvements in Mr Watt's engines left the graceful vessels relegated to history.
=Johnson=