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So here's one that doesn't seem to be the norm when it comes to fuel systems of the day. Had the 68 Charger R/T numbers matching 440/727 since '87 with 77k miles at that time. Never touched anything with the fuel system basically from the pump back to the tank, nor did I have any issues with it...

For those of you who require more octane than can be found at the pump, are there any products that you've tried and found that it worked as advertised? I can easily get ethanol free gas where I'm located but it's mostly 89 octane.