OK I looked up specs on Altima Hybrid. 158hp ICE +40hp electric = 198hp. Base Price= $26.8K 35mpg City/ 33mpg Hwy. By the time you get all the options you are looking @ $30K for the Altima Hybrid. So it probably has a 20gal tank.
Those are good specs but if I were looking a a midsized Hybrid I'd have gone with the Ford Fusion. Better Specs and better Price.
But the car is a different animal than the Chevy Volt. If you stay under 40miles per day you will use NO gasoline. Even when the ICE Engine comes on you get over 40mpg Highway (not sure about city). And the 33.5K price the Chevy Volt is loaded with options. So I'd take the Volt any day over the Altima. But do you think there will NEVER be in technical improvements in personal transportation? If you do then what would they be? Are you against new technology? Are you a Luddite? And let me remind you the Volt was started long become the election of Obama.
My daughter's Altima Hybrid cost $24g, not $30g. Not everyone buys the fully loaded versions with gps electronics media system, that's like another $5g. Basic stereo system was fine. She paid a little more for tax, but got about $6g tax credit on her taxes, so her actual price was under $20g! To be fair, this was a couple years ago and prices may have climbed a couple grand since then.
She presses the Start button, you hear no sound, and she drives away on battery power.So for short trips, she's mostly on the batteries. This is comparable to your Volt. She really doesn't use much gas until she's on the highway.
Stop speculating, you don't know anything until the Volt is available. As I said, the Toyota, Nissan and other hybrids have been available for years and are proven products. Nothing is proven about Volt other than it is excessively expensive.