All of the griping about comparing a Volt to a Corolla instead of 3-series is a valid point, but also overblown IMO. Most car buyers are not looking for a luxury vehicle and would not even consider buying a BMW, so for them it makes much more sense to compare the costs of buying and operating a 4-door sedan Volt to another 4-door sedan that they might actually buy.
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The car I was acutally comparing it against was a Cadillac ATS. I would not buy Foreign so the 3 series never had a chance with me.
But the class of the car I would definelty put it into the Sports Sedan type. It may be taughted as a ECO car, but after years of developing Ride and Handling systems, IMO this car competes with some of the best Sports Sedan class cars on the market.
The attributes of; 270ftlbs of torque, P215/55R17 wheels, ZF Sensotronic Steering, direct acting stabilizer, Unsprung weight reduction (lower control arm, knuckle: aluminum components, stabilizer links: Plastic), 4 wheel disk brakes, lightweight forged aluminum wheels (also unsprung weight reduction), etc... are not usually seen on economy or luxury cars. These are cost adders that are usually seen on Sports Sedan, and performance vehicles.
Also after BMW got there hands on one of these they felt it was a big enough threat to them that they hired the Project Manager of the Volt Program.
Excerpt: "But it wasn't only the independent and experienced automotive journalists who were impressed by how well the Chevrolet Volt performed -- the competition was, too. BMW in particular.
The top brass at BMW got their hands on a Volt and after test-driving it, they concluded that if they were unable to match the superior performance of the Chevy Volt, over time they would be creamed in the market. So what to do? BMW needed access to GM's secret sauce for this revolutionary powertrain."
http://www.thestreet.com/story/11451833/1/how-the-chevy-volt-became-a-bmw.html