Much ado has been made of hypermiling and related activity - yet the easiest, by far, method of reducing fuel usage is by not driving solo. So, for the hybrid fan-atics, what's the highest PMPG - multiply the achieved MPG by the number of passenger-miles driven.

With that as a standard, a 5 person carpool in a minivan achieving 20 MPG will get 100 passenger-miles per gallon. So, how about it? Anyone break 200?