I found an interesting site today http://www.afdc.energy.gov/afdc/vehicles/electric_emissions.html Site Assumptions 1 Gasoline contains approximately 20 pounds of CO2 per gallon source: U.S. Environmental Protection Agency (EPA). 2 Grid electricity contains approximately 1.6 pounds of CO2 per kilowatt-hour (source: U.S. EPA). 3 Electric efficiency is 0.2** kilowatt-hours (kWh) per mile (source: Idaho National Laboratory). 4 Gasoline costs $2.50 per gallon. 5 Electricity costs $0.12 per kWh source: U.S. Energy Information Administration (EIA). 6 Gas mileage rates are 26.7** miles per gallon (mpg) for conventional sedans and 38.7** mpg for HEV and PHEV sedans (source: U.S. EIA). . ** Be careful with these EPA assumptions and assessment values. CO2 emissions from a gallon of gasoline = 8,788 grams = 19.4 pounds/gallon Grid electricity contains approximately 1.6 pounds of CO2 per kilowatt-hour (source: U.S. EPA). CO2 emissions from a gallon of diesel = 10,084 grams = 22.2 pounds/gallon Results in the following per 100 miles (my assumptions and calculations): Conventional = 75 lb CO2; $9.36 fuel cost [assumes 26.7 mpg @ $2.50/gallon] Hybrid Electric = 52 lb CO2; $6.46 fuel cost [assumes 38.5 mpg @ $2.50/gallon] like the hybrid Fusion, Milan, and MKZ Prius = 40 lb CO2; $4.97 fuel cost [assumes 50 mpg @ $2.50/gallon] Volt = 54.7 lb CO2; $5.94 fuel cost [assumes (Volt) 12.9 kWh/35 miles @ 12¢/kWh and 37 mpg @ $2.50/gallon] Leaf = 54.8 lb CO2; $4.08 fuel cost [assumes 340 Wh/miles @ 12¢/kWh] 61 mpg(US) combined Focus diesel = 36.4 lb CO2; $5.08 fuel cost in mixed driving [assumes 61 mpg(US) combined for the light-footed US driver @ $3.10/gallon for diesel] http://www.autocar.co.uk/SpecsPrice...n/Ford-Focus-1.6-TDCi-109-ECOnetic-S/S/58784/ There is an Astra diesel that is NEDC rated at about 63 mpg(US) combined as well. http://www.autocar.co.uk/SpecsPrices/SpecsAndPricesEdition/Vauxhall-Astra-1.3-CDTi-ecoFLEX-ES/60136/ BUT ... please DO NOT OVERLOOK Geely's 62 mpg(US) combined 2010 Volvo C30, S40, and V50 DRIVe Stop/Start DIESELS that are right up there with those 60 plus mpg Ford Fiesta, Focus, and Astra diesels. http://www.autocar.co.uk/SpecsPrices/SpecsAndPricesEdition/Volvo-V50-1.6D-DRIVe-ES-Start/Stop/60223/ Just in case anyone is interested.