You pay no premium for the privilege and good feeling that comes with driving a flex-fuel vehicle. And you shouldn't, not even a penny more. And to think – on General Motors’ flex-fuel vehicles, you get a cool yellow gas cap in the deal. It could be the only technology automakers don’t charge more for, even though they’re now marketing it heavily. This may be because as of today, a flex-fuel vehicle has little application outside of fleets and the Midwest, making it an unlikely purchase-driving benefit. Should that change, you never know -- we may yet see some price add-ons for special flex-fuel vehicles, if supply and demand is ever truly solved. After all, automakers never met a marketing-driven benefit they didn't enjoy charging a premium for.