A new space-aged propeller plane could overtake business jets at a fraction of the running costs. California-based Otto Aviation claims its prototype Celera 500L can cruise at 450 mph, with a continental range of 4,500 miles. But the most striking boast is an environmentally-friendly fuel efficiency between 18 and 25 miles per US gallon (mpg), comparable to a large car. By comparison, a Bombardier Learjet 60 manages 2.5 mpg while cruising at 500 mph, giving a range of around 2,700 miles.

New Luxury Prop Plane Boasts Speed of a Jet, Fuel Efficiency of a Car and a Fraction of the Costs