Utah County and Mountain Fuel Supply Co. likely will enter into an agreement for a study on the feasibility of using natural gas in the county's fleet vehicles.

Under the proposed agreement, three sheriff's department vehicles would be converted to operate on natural gas as well as motor fuel for six months. The conversion would be done by Mountain Fuel and paid for by the county - estimated to be between $2,500 and $3,000 per vehicle.Mountain Fuel would provide natural gas to the county at the initial price of 63.3 cents per gallon. During the test period, the vehicles must be operated 70 percent of the time on natural gas.

In reviewing the proposal recently, commissioners said the study is not a cost-saving measure. The cost of operating on natural gas is comparable to using motor fuel.