各种燃料二氧化碳排量如下，在美国推电动车的经常以天然气发电排放为参数，其中有一些大学研究报告，这样要好很多；但是美国有大约40%的电是用燃煤发电。如果以后X年后都转成天然气发电就好了。
Pounds of CO2 emitted per million British thermal units (Btu) of energy for various fuels:
| Coal (anthracite) | 228.6 |
| Coal (bituminous) | 205.7 |
| Coal (lignite) | 215.4 |
| Coal (subbituminous) | 214.3 |
| Diesel fuel and heating oil | 161.3 |
| Gasoline | 157.2 |
| Propane | 139.0 |
| Natural gas | 117.0 |
