Gas from Fargo’s landfill is already used to generate power and heat, but there’s enough left to fuel the city’s buses and garbage trucks as well. By removing moisture and impurities, the landfill gas can be converted to natural gas suitable for use in specially equipped vehicles. That’s a good thing because fuel is one of the highest costs of operation for city vehicles. City buses, garbage trucks and police cruisers use an estimated 1,118 gallons a day or 407,900 gallons a year. City staff is mulling converting part of the fleet to natural gas, especially residential garbage trucks, which get terrible mileage due to stop-and-go driving.