[adorno]

Cars generate wind when they’re in operation. Just put a wind turbine on ‘em...

Well, cows 'generate' a lot of gas, so, why not put a cow or two on a car's roof, or provide a trailer behind the vehicle to carry around your own fuel?

Alternately, how 'bout going back to the horse-drawn carriage? Or the coal-fired engine like locomotives used to have?

[mrsmith]

Better to uses horses or oxen.
Get the fuel and the horsepower!

(And maybe a way to switch from oxen in city driving to horses on the highway.)

You may see solar power coatings on drones before cars.

[mumblypeg]

Reminds me, do you know why Mexicans wouldn’t buy the Chevy Nova when it came out?
Because “no va” means “won’t go” in espanol.
Seriously.