And a GPS can also be used to monitor the driver's comings and goings; need I say more?
CBS) College student Jayson Just commutes an odometer-spinning 2,000 miles a month. As CBS News Correspondent Sandra Hughes reports, his monthly gas bill once topped his car payment.
"I was paying about $500 a month," says Just.
So Just bought a fuel efficient hybrid and said goodbye to his gas-guzzling BMW.
And what kind of mileage does he get?
"The EPA estimate is 60 in the city, 51 on the highway," says Just.
And that saves him almost $300 a month in gas. It's great for Just but bad for the roads he's driving on, because he also pays a lot less in gasoline taxes which fund highway projects and road repairs. As more and more hybrids hit the road, cash-strapped states are warning of rough roads ahead.
Officials in car-clogged California are so worried they may be considering a replacement for the gas tax altogether, replacing it with something called "tax by the mile."