Comparison of Alternative Fuels to Gasoline
|
|
Direct Emissions Compared to
Gasoline |
Other Issues |
||||
|
Fuel |
Reactive HC |
CO |
Nox |
Toxic Emissions |
Ozone Reactivities |
Global Warming |
|
Natural Gas |
Much Lower |
Lower |
Similar |
Much Lower |
.018 |
0.8 |
|
Propane |
Lower |
Lower |
Similar |
Lower |
0.50 |
0.8 |
|
Methanol |
Lower |
Similar |
Similar |
Similar |
0.41 |
1.0 |
|
Ethanol |
Lower |
Similar |
Similar |
Similar |
.063 |
0.4-1.2 |
|
Ethanol (5-10% blend) |
Slightly Lower |
Lower |
Slightly Higher |
Similar |
Similar |
0.9-1.0 |