Over the last few decades, the U.S. has built a vast portfolio of powerful technologies to save and replace oil. Yet nobody had totaled exactly how much oil these new technologies could save, until my team at Rocky Mountain Institute did in 2004. Our largely Pentagon-funded study Winning the Oil Endgame showed these technologies could more than replace all U.S. oil use, at an average cost of $15 per barrel (in 2000 dollars). Five years later, that finding looks conservative. Oil, as I'd long predicted, has become uncompetitive even at low prices before it became unavailable even at high prices.
Buy a good hybrid vehicle, drive it properly, and you'll halve your oil use per mile. Make that hybrid out of very lightweight materials and make it aerodynamic, and you'll halve your oil consumption again. Fuel it with 85% ethanol made from woody, inedible cellulose like switchgrass, and you'll save three-fourths of the remaining oil. Make it a plug-in hybrid, and your savings rise to 97%.
forbes