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@HappynSantaMarta @noodlemaz @nspugh Most billionaire's private jets are basically small airliners and are lucky to get ONE mile per gallon. Even a tractor trailer with a full load burns less fuel than that.

The automotive equivalent would be a private bus and chauffeur as one's personal car,but that bus (being a diesel) is probanly good for 10mpg not 1mpg.

There are private planes that burn much less fuel but they are flown by their owners and not by billionaires except as a hobby. Note that they usually cannot do their own work, unlike those who fly "experimental" classed homebuilt planes. Many of these even well beyond the ultralight class are very light and have tiny engines. VW Beetle engines have been popular and more recently some have used water-cooled 1 liter Geo Metro engimes or even motorcycle engines. None of these can possibly burn the kind of fuel Elon's miniairliner does and they normally fly nowhere near as far either.

In fact, such things as Gulfstreams and Learjets are sometimes used as airliners, on routes that don't get enough traffic to justify a jumbo jet. Than there's Air Force One, which at least used to be a full-on Boeing 747