When looking at tailpipe CO2 emissions based on energy consumed, different fuels have different chemical properties:
| Fuel | % hydrogen (weight) |
LHV MJ/kg | LHV kWh/kg | g CO2 per kWh | Theoretical % CO2 reduction |
| Methane (NG/biomethane) | 25,0% | 50,0 | 13,89 | 198,0 | 29,2 |
| Propane (LPG) | 18,2% | 45,6 |
12,67 | 236,8 | 15,3 |
| Butane (LPG) | 17,2% |
45,3 |
12,58 | 241,2 | 13,7 |
| Diesel |
13,5% |
42,7 |
11,86 | 267,5 | 4,3 |
| Gasoline | 13,5% | 42,4 |
11,77 | 279,5 | 0,0 |
The second-last column of the above table shows the tailpipe CO2 emission resulting from the burning of one kWh (LHV – lower heating value) of each respective fuel.
The last column shows the theoretical reduction of CO2 emissions, compared to gasoline in vehicles with identical properties and with identical engine efficiency.
Please note that the energy contents and the tailpipe CO2 emissions from diesel or gasoline will change when instead using a blended fuel containing biofuel components. Lower heating value contents and chemical composition must be stated for each fuel in order to calculate the theoretical CO2 emissions per kWh LHV in each fuel.
NGVA Europe...for sustainable mobility
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