I built my TCO calculator (linked in signature) precisely because there are none offered on the interwebz, and there's no transparency in how sites like Edmunds does their calculation. Furthermore, it has to make certain assumptions like the price of petrol or electricity that will not be accurate for your location.
The #1 cost by for of any new vehicle is depreciation, and it's not even close. That's why the cheaper the car you get, the lower the TCO will be. The only time efficiency becomes a large factor in TCO is for those that put a lot of miles on a vehicle that was purchased used (most depreciation already occurred).
If purchasing a new car and holding onto it for a long time, efficiency becomes a greater factor as well.
The Bolt is going to be the TCO winner if the 250 mile range (maybe as bad as 120 in the depths of winter going up the mountains) is acceptable to you. It's also not going to waste your time with needing head gaskets and whatnot.
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