Careful, Marvel Oil in Gas with Catalytic conv, can clog cats. I've been using Marvel for 45 years, back in the day we put it in the tank. But it's an Oil and any oil kills Cats. Dead Cat BounceHave to say me and my TJ are getting to be friends. I stared using Lucas fuel additive and did about four tanks of that through it. I have now ran two tanks with Marvel in the gas.
You can stop using all those additives, especially so much of them, they're really of no benefit. They're just big profit-makers for their manufacturers and retailers. Not to mention the EPA requires ALL US gasolines to contain adequate fuel cleaning additives to keep the fuel system clean. That wasn't always true, we needed fuel injector cleaners up until the mid-eighties when the EPA started mandating them in ALL US gasolines. Not just Tier One gasolines, all of them.