Gumout Octane Boost, 10 oz- 510022W

Don't buy premium fuel, save money buying regular grade and adding octane booster. You'll save money. No matter what grade or fuel you buy at a given station they all have the same additive package, the only difference is the amount of octane. If you buy 8 or more gallons at a time you'll save money buying regular grade and adding this booster. It works great. No pinging and no power loss.

I used to think I needed a good fuel injector additive, but it looks like I needed an octane booster additive. this product makes my 290k miles, 25-year-old luxury sedan drive, as if I did a major tune-up. also, it stopped the knocking that would occur in very hot summers, which contributed to exhaust smoke sometimes. all of that has gone away, and I think the results of the engine not knocking encouraged the AC to perform better in hot summer months.