|The Prius II CNG|
Two West Swiss natural gas companies—Holdigaz SA and Gaznat SA—have retrofit a stock Toyota Prius with a natural gas fuel system. The resulting bi-fuel Prius II CNG is on display at the Geneva auto show.
The companies preserved the original engine, but adapted the fuel injection system to handle natural gas as well. The Prius II CNG retains its original 1.5-liter and 11.9-gallon gasoline tank. The retrofitters added two 22-liter natural gas storage tanks, with a capacity of 4.5 kg each.
|The gas tanks in the Prius II CNG.|
The gas tanks sit in the area formerly occupied by the spare wheel. The tanks and other natural gas gear add approximately 60 kg (132 pounds) to the weight of the vehicle. The addition of 9 kg of natural gas extends the Prius’ range by about 250 to 300 km (155 to 186 miles).
With all power sources combined (gasoline, CNG and electric), the Prius CNG has a range of about 1,300 km (808 miles). The motivation behind the conversion, though, was not range extension but rather a demonstration of lowered CO2 emissions.
When operating on natural gas, the Prius reduces its carbon dioxide emissions from 104 g/km to only 92 g/km.
The conversion cost 6,500 Swiss francs (about US$5,000).
|Bivalent Prius II CNG Engine Performance|
|Max power||57 kW (76 hp)||52 kW (70 hp)|
|Torque||115 Nm||110 Nm|
|Fuel consumption (comb.)||4.3 l/100km||3.4 kg/100km|
Toyota Prius II Erdgas data sheet (German)