A propane cylinder with 8 gallons of propane has been added to one of the mowers. The research is showing that for every hour of service we will use 1 gallon of propane. The key to this is cleaner burning fuel. This is good for the environment along with being better for the operation of the machine. One of the other key factors for doing this is the lower cost of the propane verses gasoline. The price of propane is about a $1.70 cheaper than a gallon of gas.