After “right-sizing” your fleet, larger vehicles will still be needed for many tasks. Because fuel efficiency gains are more difficult with medium- and heavy-duty vehicles, they are good candidates for the use of alternative fuels. However, not all fuels provide equal greenhouse gas and air quality emissions benefits. For this reason, consider using fuels like compressed natural gas (CNG), liquid natural gas (LNG), or propane (LPG).

One out of every three vehicles operated by Fort Collins, Colorado is powered by propane, resulting in a reduction of 140 tons of CO2 per year.