You know... the whole trick to distillation is that alcohol boils (turns to vapor) at around 187 degrees (F) and water at 212 (F)... Not a spectacular temp, really.
A small scale distiller, operating on, say, the waste heat from your hot water heater, furnace or even the air conditioner (yes, Skippy, part of it gets quite hot), could conceivably produce enough fuel additive to make a real difference in one's personal budget...
It does cut out oil company profits though. Expect it to remain illegal.
The act of separating alcohol from water is illegal.
If you put a can of beer in the freezer and perform a process known as "jacking", you have broken the law.
One other thing, using any kind of open flame or spark producing switching in an area that a distillery is functioning, is almost an act of suicide.
One pinhole leak in your condenser, if you are only on the second step, will end your career with a really big bang.
Like uncle Carl once said, "it ain't a thing you go messin with".