By EDWARD NIEDERMEYER

GENERAL MOTORS introduced America to the Chevrolet Volt at the 2007 Detroit Auto Show as a low-slung concept car that would someday be the future of motorized transportation. It would go 40 miles on battery power alone, promised G.M., after which it would create its own electricity with a gas engine. Three and a half years — and one government-assisted bankruptcy later — G.M. is bringing a Volt to market that makes good on those two promises. The problem is, well, everything else.

For starters, G.M.’s vision turned into a car that costs $41,000 before relevant tax breaks ... but after billions of dollars of government loans and grants for the Volt’s development and production. And instead of the sleek coupe of 2007, it looks suspiciously similar to a Toyota Prius. It also requires premium gasoline, seats only four people (the battery runs down the center of the car, preventing a rear bench) and has less head and leg room than the $17,000 Chevrolet Cruze, which is more or less the non-electric version of the Volt.

In short, the Volt appears to be exactly the kind of green-at-all-costs car that some opponents of the bailout feared the government might order G.M. to build. Unfortunately for this theory, G.M. was already committed to the Volt when it entered bankruptcy. And though President Obama’s task force reported in 2009 that the Volt “will likely be too expensive to be commercially successful in the short term,” it didn’t cancel the project.

Nor did the government or G.M. decide to sell the Volt at a loss, which, paradoxically, might have been the best hope for making it profitable. Consider the Prius. Back in 1997, Toyota began selling the high-tech, first-of-its-kind car in Japan for about $17,000, even though each model cost $32,000 to build.

By taking a loss on the first several years of Prius production, Toyota was able to hold its price steady, and then sell the gas-sippers in huge numbers when oil prices soared. Today a Prius costs roughly the same in inflation-adjusted dollars as those 1997 models did, and it has become the best-selling Toyota in the United States after the evergreen Camry and Corolla.

Instead of following Toyota’s model, G.M. decided to make the Volt more affordable by offering a $350-a-month lease over 36 months. But that offer allows only 12,000 miles per year, or about 33 miles per day. Assuming you charged your Volt every evening, giving you 40 miles of battery power, and wanted to keep below the mileage limit, you would rarely use its expensive range-extending gas engine. No wonder the Volt’s main competition, the Nissan Leaf, forgoes the additional combustion engine — and ends up costing $8,000 less as a result.

In the industry, some suspect that G.M. and the Obama administration decided against selling the Volt at a loss because they want the company to appear profitable before its long-awaited initial stock offering, which is likely to take place next month. For taxpayers, that approach might have made sense if the government planned on selling its entire 61 percent stake in G.M. But the administration has said it will sell only enough equity in the public offering to relinquish its controlling stake in G.M. Thus the government will remain exposed to the company’s (and the Volt’s) long-term fate.

So the future of General Motors (and the $50 billion taxpayer investment in it) now depends on a vehicle that costs $41,000 but offers the performance and interior space of a $15,000 economy car. The company is moving forward on a second generation of Volts aimed at eliminating the initial model’s considerable shortcomings. (In truth, the first-generation Volt was as good as written off inside G.M., which decided to cut its 2011 production volume to a mere 10,000 units rather than the initial plan for 60,000.) Yet G.M. seemingly has no plan for turning its low-volume “eco-flagship” into a mass-market icon like the Prius.

Quantifying just how much taxpayer money will have been wasted on the hastily developed Volt is no easy feat. Start with the $50 billion bailout (without which none of this would have been necessary), add $240 million in Energy Department grants doled out to G.M. last summer, $150 million in federal money to the Volt’s Korean battery supplier, up to $1.5 billion in tax breaks for purchasers and other consumer incentives, and some significant portion of the $14 billion loan G.M. got in 2008 for “retooling” its plants, and you’ve got some idea of how much taxpayer cash is built into every Volt.

In the end, making the bailout work — whatever the cost — is the only good reason for buying a Volt. The car is not just an environmental hair shirt (a charge leveled at the Prius early in its existence), it is an act of political self-denial as well.

If G.M. were honest, it would market the car as a personal donation for, and vote of confidence in, the auto bailout. Unfortunately, that’s not the kind of cross-branding that will make the Volt a runaway success.