And the the next sentence after the one about the Prius is that what hybrid buyers do in general, which would include the Volt: That article cites CNW Marketing for that tidbit, who are the same bunch who authored a report that a Hummer is greener than a Prius over its lifetime. Not a credible source. Anyhow, I couldn't get the actual JD Power & Associates report, but their press release on the report states: 2012 Avoider Study | J.D. Power Autos My conclusion is that all those posts/articles got it wrong. The first and second reason for both cars is gas mileage and environmental impact. The third reason for the Volt is image, while for the Prius it is reliability.