I have not heard or seen the ads, but I agree that it's a mistake for them to be touting the 40 mile range. Without explanation it sounds week. If they want to talk about the Volt now, they should just refer to it as a range extended electric vehicle and leave it at that. They could also say that most people would use little to no gas without the restrictions of a traditional EV. Putting the 40 mile range in the ad is a bad move. Leave specifics out and let the consumer discover what the Volt is all about on their own would be a better stratagy.
"Beer, the cause of and solution to, all of life's problems." -Homer Simpson