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One gallon in a full tank wont do anything but waste $$$$$.I run 112 in my 440 on the street at times.It has 12.5 domes so it helps.Usually I just run 93 and keep my foot out of it.Rocky
 we missed that completely & that is if it is pinging it'll take alot more than a gallon so I'd suggest if pinging is a prob & you 're not wanting to just experiment to use however much percentage is needed as you dont want to shorten the curve and no fun keeping your foot out of it 
live every 24 hour block of time like it's your last day on earth
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