I just tried a bottle of Royal Purple Max Clean from Pep Boys (also at Walmart for cheaper), can't say enough good things. I'm still on the tank that I added it to so I don't know if it will fall off next time I fill up but there was a noticeable difference in my car. I have about 55K miles, bought my car in AZ so I don't know what their gas is like or if the other owner used premium gas and the car always felt somewhat sluggish 1st and 2nd gear even with CAI and FI exhaust added on. With the Max Clean I feel like the car wants to go in the lower gears and it's more responsive in 3-6. Is this what it feels like when you go to higher end fuel injectors? If so that may be my next purchase.
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