the path not taken
Mobjectivist reminded me of good old Buckminister Fuller, who among other things had a prototype for a fuel efficient car running while Amory Lovins was still playing with tinker toys.
The Dymaxion Car
The Dymaxion car was a concept car built in 1933 and designed by Buckminster Fuller. The car was a high efficiency vehicle with a then-unheard of fuel efficiency of 30 miles per gallon and it could move 11 passengers along at 120 miles per hour.