Best fuel efficiency ever?
What aircraft burns/burned the least fuel per passenger-kilometer, or per tonne-kilometer?
To clarify: we need to carry a given payload for a given distance, but we can make as many stops as we like and as many trips as we like. The crew counts as payload; speed doesn't matter. No soaring.
Supposedly the 1-seat Quickie burned around 25 grams per kilometer (and whatever happened to the Quickie?), and a 400-seat 747 must burn about 400 times that much, so there's lots of possibilities. 757-300? A321? A 300-seat Japanese A300? How about an Icelandic 189-seat CL44J? An Airspeed Ambassador? But don't limit it to airliners.