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Give you an E for effort since you're mostly correct.
1. You mean highest gear possible, not lowest.
2. The effect of octane on fuel consumption is not that black and white: Unless you have objective proof, I respectfully disagree that higher octane yields better mileage.
3. The ScanGauge is not that accurate. Even the MFGR only claims 5%. Depending on how you drive, it will be off tank-to-tank. I have seen it be dead on, and I have seen be off by 1/2 gal out of 14.
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