I don't know if its a good idea to tweek your prius, but as I type this there are 4 guys driving a prius on city streets trying to get a 100mpg tank. At about the 1/2 way point in the tank they are around 105mpg.

My hydroponics experiment

You ever notice how hard it is to lip read cartoon characters?
"Crazy is what the sane call Delta Flyer"