Salty! and true. When I was a kid in the 70s we were sure we'd have flying cars before 1999. Not sure how they were supposed to be powered - I should have been paying more attention in school.
No doubt dead dinos are amazingly energy dense.
Look at the solar impulse - they kind of proved the concept of an electric aircraft - now it's up to the rest of us to take that work and run with it.
https://aroundtheworld.solarimpulse.com/
Some of the guys that built that are on this forum building RVs - I'm sure that they can chime in with their views.