You know I not sure I buy into all this keeping the injectors clean with top tier gas. I have been driving for 50 years, plus I drive an average of 20,000 miles per year, I have owned many cars throughout this time. My fuel injection cars have all gone over 150,000 - 200,000 miles, and I have never once had the fuel injectors cleaned or serviced on any of my FI cars. I don’t seek out the top tier gas stations, just my local convenience store stations. Never had misfiring or stumbling issues.
Maybe I am lucky, not saying this is wrong, but I never have had any issues with FI, just my own experience.
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