All things "mechanic in a bottle" are snake oil. No exceptions. Use the lowest octane fuel that your car requires, use good oil and a good filter. That's it.
The marketing of fuels as "regular" and "premium" was absolutely genius, as they have the majority of the public totally fooled into thinking higher octane fuel is somehow better for their car. It isn't. Use the lowest octane fuel that your car requires. Period. No boosters, no additives, no nothing. Unless you enjoy spending money for the sake of spending money, in which case why not donate it to charity instead? Then it might actually do some good.
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