Shell 91 or Petro Can 94

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I'm sure this thread would have been posted before but can any that's used both comment on which they prefer, any noticeable differences and why you would suggest one over the other. I use 94 @ Petro but was told today to try Shell as the fuel is better.
 
I'm sure this thread would have been posted before but can any that's used both comment on which they prefer, any noticeable differences and why you would suggest one over the other. I use 94 @ Petro but was told today to try Shell as the fuel is better.

I have been running only 94 in everything I own daily beater, bike and NSX. Never had a problem with Sunoco or Petro 94. If your running stock engine with stage 1 mods then 91 is good enough. But for those guys running FI cars should be running the highest octane possible, always safer to over-octane than under running it remember boys and girls detonation kills any engine quickly. :cool:
 
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