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Rbrowning, the correct CO2 equivalence factor varies with time and place, but they should have at least tried to nail it down, using the most recent US grid average available. Their current estimate of the grid being 100.0% efficient was off by a factor of three, and gas should also get a 17% penalty for the energy required for refining and distribution.
Lots of people will use cost-equivalence, and I won't blame them. I'll just point out that there are all kinds of costs and subsidies that method ignores. For example, it doesn't apply a carbon tax to either fuel, and it doesn't explicitly care about the oil spills in Nigeria.
At the current US average prices of $2.78/gal and $0.12/KWh, PAXP's mpge numbers for EV's are 50% larger than they should be by cost equivalence.
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