Montgomery County paid more than $100,000 for a new car-sharing program that was used 16 times in 3 1/2 months, according to county data.

As of April 24, the 28 fuel-efficient cars have been used a total of 83.5 hours since the pilot program was introduced in January. With the county paying Enterprise Rent-A-Car a flat rate of $1,100 a month for each hybrid and subcompact car, the county has essentially been paying more than $1,300 an hour to use the cars.