[markcerqueira]

But by then the car will be able to engage its flight module, take off, and fly you directly home.

[TeMPOraL]

Even if, the car will have to calculate whether it has enough clearance to deploy the wings so that it doesn't cut down a pedestrian, or whether there's anyone that could be caught in the engine wash.

Interesting as it may be, it's only shifting the problem ;).

[dllthomas]

Maybe. Flight generally uses quite a bit more energy.

[sokoloff]

Yes, but perhaps less than you think. I fly small aircraft, and the one we fly gets ~15 mpg in cruise carrying up to 6 people at just over 200 mph. There are cars/trucks on the road that get less than that. If I slow it down to 150 mph, I can get over 20 mpg.