Emissions Reductions Gasoline Propane Difference
Total Vehicle Life (miles) 200,000
220,000
Average Miles per Gallon 12.00
10.20
Gallons of Fuel Used Over Life of Vehicle
18,333.33
21,568.63
(3,235.3)
Carbon Mass per Gallon Fuel (lb. / gal.)
5.10
3.47
Mass of CO2 per Gallon Fuel (lb. / gal.)
18.70
12.72
Total lbs. of CO2 Produced During Vehicle Life
342,833.27
274,352.97
68,480.30
Fewer lbs. of CO2 Produced Using Propane Autogas
68,480
Assumptions:

Fuel Properties Used Gasoline (C8H18) Propane (C3H8)
Fuel Density (lb. / gal.) 6.07 4.23
Energy Density (BTU / gal.) 114100 84300
Main Constituents (% by weight) 84C 16H 82C 18H