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I personally have not seen any difference b/t brands. I normally run Shell. I have been having issues the past couple years w/ rattling the converter bolts loose b/c of detonation. Not audible, but it is doing it. Just replaced the flexplate and bolts due to this.
I recently found a store locally that has ethanol free fuel so I'll be trying that soon. If the ethanol free stuff doesn't help, then I'm gonna have to start mixing again. Makes me mad b/c the whole reason I built this hemi is b/c I was tired of buying race fuel.
Seems like the last couple years the pump fuel has really gotten bad.
I also had som pinging this summer where I had always ran my timing, and had to re tune a little. I also had a convertor bolt and a trans bolt come loose I caught...Pump gas has gotten bad, and all we have around here now is 91 junk fuel with ethanol.
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