Instruct: Classify the given review as either positive or negative.
Query: Great price, although little difference in performance and mileage

I got these spark plugs quickly, for a good price, and they work, although I am disappointed that they haven't made my car run that much better. I bought these figuring that my spark plugs needed to be changed, and I have realized that my gas mileage hasn't improved much at all since changing them, and the car performs just about the same. I had been told that Laser Iridiums would be better, but I say, save your money and stick with your OEM plugs.