if US can GO from JFK's urging to Make the Moon...
US did it in about 5 years...
WE CAN darn well come up with progressively efficient veeehicles.
Prime ingredient is WILL.
Ahab can go get buggered by a Hobson's Choice of camels.
No offense intended...just the 'struth...
"Prime ingredient is WILL." Will, or even WILL, cannot overcome the second law of thermodynamics. If you could invent the "250 mpg" carburetor, or the "million KWh battery that can be recharged in 10 minutes", I guarantee you that you would become a billionaire.