Hey, PhilD - A question about the octane thing. I understand the higher compression thing relative to higher octane but how does the higher octane enter into the programer settings. I recently put on the Superchips programer and their "Performance/Towing" setting requires 91 premium gas. Funny thing is that this weekend we filled the rig up with about half a tank if regular because I was going to reprogram it to the lower setting to use regular fuel. We went from 10.6 mpg to 11.5 mpg after putting in the regular and not touching the programer yet. I'm thinking of trying to run at the "Performance" setting with regular fuel to see how it does. Has anyone out there tried this yet?
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Used to be an H2 owner
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