You have to compare like for like. A 60mpg is not equivalent to 3mpkwh. 60mpg is top end efficiency and 3mpkwh is bottom end.
If you can't charge at home, right now, I'm not sure I'd advice an EV yet. Public chargers are normally a rip off. It's pretty much the same kind of costs as fossil fuels. It needs tackling frankly.
If you got solar and a home charger , then yes, you can drive around even cheaper than my numbers. I know people whose mile cost is basically zero over summer and only the same as me in winter.
The upfront costs are coming down as the ranges go up. Long run, economics alone will kill ICE. Even without the negative feedback loops it will get in as there is less ICE so less economics of scale.