Both the diesel and payment thing (along with a host of other problems) could be solved by a transmitter/receiver setup like some metropolitan areas use for toll-road payment.
Put the little box in your window, and the station would know what gas you take, what cigs you smoke, and debit your card (via a previously set-up account) without you ever having to leave your car.
Neat robot.
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-D.
ICQ: 202-96-31
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