Abstract: A system for determining fuel usage within a jurisdiction includes a control computer operable to control fueling of an internal combustion engine and an auxiliary computer coupled thereto, wherein the auxiliary computer forms part of an operator interface unit. The control computer is operable to broadcast current fuel usage information in a number of fuel usage categories, and the auxiliary computer is operable to accumulate such fuel usage information within each jurisdiction traveled by the vehicle. In one embodiment, a GPS receiver provides the auxiliary computer with information relating to a current vehicle jurisdiction, and in an alternate embodiment, an auxiliary switch is provided wherein manual actuation of the auxiliary switch indicates entrance into a new jurisdiction.