I like Chad's idea of doing the monthly payment + fuel cost calculation and all the other commenters who have said that the only consideration most people make is what is their total monthly payment.
So as a first stab I made this chart - which shows which electric car is the same or lower cost ( monthly payment + fuel ) than the gas car you are considering.
On the left is the price you would pay for ( finance ) the gas car. Across the top is how many miles per year you drive.
The car is assumed to be financed for 6 years at 3%.
I had to simplify and make all the gas cars the same: 20mpg burning premium at $4.75 a gallon. ( Seattle area prices are actually pretty close to that )
The comparison is for the very first month of financing, so the fact that you would save a lot of money in the future as gas prices increase ( and after you have paid off the loan ) is totally ignored.
For those with access to cheaper gasoline, here is the same chart with gas at $4 a gallon.
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