While you are correct in the sense that if you drive enough, the savings of not buying fuel do add up...
The use case where that is true is narrow...
There are plenty of very efficient small cars that can be purchased for $10K+ fewer dollars than the Volt. Over 5 years of ownership, you'll be hard pressed to burn $10K in gas in a small 4 person car over the cost of recharging a Volt.
Add to that the resale of a Volt in 5 years is likely to be terrible as they keep dropping the price, it makes for an even worse investment.
It may well get there, but the people pushing for it today like to ignore a few details that explain why EVs are hardly a rounding error in vehicle sales.
It isn't because people want to waste money, it is because people have done the math and it makes no sense, unless you're "a true believer".
Riiiiiiiiight, so that bargin $15K ICE car is never going to need maintenance? I have a Volt and my maintenance cost is 0 so far for 2 years. I doubt I will reach the first scheduled maintenance (which can be at 75,000 miles depending on usage patterns) and is just an oil change for the generator which can easily be done myself for $10 in oil. The parent said its about COST, not price. Costs like maintenance that EVs don't really have in practice are not free for ICEs. EVs are cheaper for 90% of drivers daily usage patterns at this point. Not some minor slice of the market, but most of the market. You would have to drive less than 1000 miles a year for an EVs to not to pay off at this point. You are just considering gas costs, but maintenance costs can easily exceed gas costs, especially for cheaper or older ICE cars. Plus the time I don't spend waiting at tollbothes (yea HOV lanes). Just make sure not to lease the Volt as you don't get the $7500 federal tax credit that way.