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Just curious as to what octane everyone is running in there 6.2L I use 87 in the winter and 93 in the summer. Figure the cool/dense air in the winter makes up for lost hp of the 87 octane.

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Mine is tuned for 91 octane, so i try to only put that in, but it is not available everywhere here in ND. I may try to use some E-85 now that gas has gone up so much.

 

On a side note. To run E-85 would it be better to put the stock tune back in, or do you think it would be better to leave the 91 octane tune in while running E-85?

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For the tune mine runs the same on E85 and 93. I sent files to Justin to compare as I had mine tuned with E85 and he stated there was no adjustments he would make.

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