“Black boxes” in cars would be anything but a “money saver.” The most obvious use would be to track one’s driving habits, speed averages, and aggregate mileage over a period of time. With that data, the Green Police, with government backing, would then see to it that car owners would face new taxes (for driving over a fixed number of miles per year), new surcharges (say, when the black box detected speeding, or an “excessive” number of “inefficient” short trips), and even forced car turn-ins (the automotive equivalent of “Logan’s Run”) when the authorities decided a given car wasn’t being maintained to some bureaucratic standard. And these are just the most "benign"possible uses. Not even getting into governmental usage of “black box” data to control behavior – such as remote disabling of cars for allegedly unauthorized use, tracking individual’s travels, etc. No thank you.