I watched that report from DC, and it was and is WRONG. Its true that sensors can make small adjustments for a limited time, but not enough for you to continually run lower octane. If you don't see a difference, your car and it's sensors do. The last thing an auto manufacturer wants to do is tell you to spend money on something they don't sell or control. If it didn't require premium, they wouldn't tell you to buy it. Someone said it very well above, If you can't afford one, maybe you shouldn't have taken one home. If you need to save money on gas, GO BUY A PRIUS!!!