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I can't speak to your vehicle, but can give you some information on my RAM. When I was in northern Utah (4700 ft elevation), the low grade at the pumps was 85 octane. The truck's factory tune would run on it, but when I installed an 87 octane tune from Superchips the engine would ping on 85 octane. I had to run the mid-grade, which was 88, in order to run the 87 tune. I've never tried to run the Superchips 91 tune on 97 octane. In fact, the folks I've chatted with do not recommend using 87 octane with the 91 (or 93) tunes...
At light throttle settings I've seen 39-40* advance with 87 octane, and 45* with 91 octane.
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