I just used Redline's cleaner just for the hell of it. No difference and I'm sure it didn't do any harm other than costing me a couple of bucks. Like that article said gas companies put a cleaner/detergent in their gas so our injectors should be pretty clean. I've heard that before and sounds true. I also read about flow rates and things about injectors that is way beyond me, for early cars say an early Z. I'm sure the injectors in our cars are way better and shouldn't ever "clog" like a later model car with poor fuel injectors and run on poor gas.