Emissions Reductions Gasoline Propane Difference
Total Vehicle Life (miles) 220,000
220,000
Average Miles per Gallon 7.00
5.95
Gallons of Fuel Used Over Life of Vehicle
31,428.57
36,974.79
(5,546.22)
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
587,714.26
470,319.33
117,394.93
Fewer lbs. of CO2 Produced Using Propane Autogas
117,395
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