Nice windmill. How come you don't have it hooked to a generator?
I may not have a car that gets 70 mpg; but I've usually bought a commuting vehicle at the low end of the price and size range; and the top mileage of a pure gasoline compact car has been pretty consistently 30 to 35 mpg. Subcompacts can get a bit more, sub-subcompacts a smidgen more than that.
The problem with the really small cars is wind resistance. You can reduce the resistance, but then comfort and visibility to other drivers is lost. And getting accidentally blown off the road, or run over by a semi is a lot worse than not getting 50+ mpg!
I've had enough economics to know that the margins of income lost from the middle class are pretty equal to the amounts padding the rich and ultra rich. As much as politicians and the rich themselves say that giving up all their wealth wouldn't make everyone else wealth; they're wrong. Scaling them back would restore discretionary spending to most of the upper lower class, restoring them to lower middle class status and greatly increasing the spending done by them.
Sadly, history is full of miserable examples about the corrections for that problem. Because the wealthy are usually too greedy and self-centered to make the change themselves, it usually requires violent revolutions to redistribute wealth. At least for a generation afterward, everyone suffers.