There is precedent, sorta, in aviation: 100LL hit $4.50 a couple years back and is now between $5-$8. Cessna started developing an electric 172 in 2010: http://green.autoblog.com/2010/08/11/cessna-developing-elect... I say "sorta" because it's not an industry-wide movement.
I think the energy economics are different for planes and cars, though. There's no equivalent of regenerative braking, or for that matter stop-and-go traffic, for planes. And adding weight to a car doesn't make it use more energy at high speeds, which is how an old van can get 15 miles per gallon while a fully loaded semi truck gets 10 miles per gallon. Adding weight to a plane does make it use more energy. The effec…
Point the nose down with the power off?