Jefferson County has been using propane to fuel its vehicles for over 30 years, saving $120,000 per year in fuel costs. Propane costs less than $1 per gallon due to a 50 cent per gallon federal rebate. Vehicles that travel an average of 85,000 miles per year see payback on the $7,000-$8,500 propane system conversion cost within 8-10 months. While the county's propane program started in a makeshift way, technology improvements have made propane systems more reliable and easier to use.