To the best of my knowledge, none of the big car manufacturers have any electric cars that is anywhere comparable to the mileage of Tesla. The second best option, Nissan Leaf, has less than half of Tesla's mileage.
I assume by "mileage" you mean "range"? But yes, the Leaf has a shorter range than the Tesla Roadster, and is also a lot cheaper. Price vs range is the basic tradeoff when building an electric car. Nissan could build a more expensive Leaf with a longer range if they thought there was a market for it.
I like the Chevy Volt's best-of-both-worlds solution, since it will do your sub-40-mile commute on electricity but still fire up its petrol-powered generator if you want to do hundreds of miles on the weekend. For an electric car, a zero risk of getting stranded is a huge selling point.
That may be true, but only because the Tesla Roadster has twice the battery capacity (53 kWh vs Leaf's 24 kWh). The Roadster battery costs about $36,000, which is more than the sticker price of a Leaf. The Roadster is supposed to get 21.7 kWh/100mi, which is about the same as the Leaf (22.5 kWh/100 mi) and the Volt (25 kWh/100 mi). Given the current (im)maturity of the electric car industry, I would say those numbers are too close to differentiate.
Can anyone else verify this?