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That is understood jswd60 and I do run it on performance w/ 91 + octane fuel, but if I change the program back to towing or 87 octane for example when I want to tow a trailer should I put lower grade octane in. I did read that it should go the other way if you are running performance for example that you should use the higher octane fuel because it wont detonate the 87 octane fuel well enough. Thanks
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