The octane rating of Esso regular gasoline is 87, Esso Supreme is 92. The rating of US gasoline is often as low as 82. Propane is a clean burning fuel, producing water vapour and carbon dioxide as waste products. It enters the engine as a gas, so it does not have to be vapourized like gasoline in a warm engine. Since there is no water content in the fuel, vapour lock in hot weather and high altitudes is not a problem or is fuel line freezing in winter.
Propane even reduces emissions in vehicles without emission control devices.
In British Columbia alone there are 1,100 propane refill stations compared to 1,700 gasoline refill stations. Existing refuelling stations are capable of handling three times the current volume of business. These vehicles will be capable of operating on either propane or gasoline fuels with comparable power but less emissions. The company has a demonstration fleet of 24 propane powered 6.8L V10 Excursions placed in twenty cities around the country undergoing testing for emission-control technology and to determine if there is a market for the vehicle. Any dual-fuelled vehicles should be operated on gasoline briefly every month to keep the gasoline lines and seals from drying out.