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To be fair, I have never put it in the oil, I have just used it as a "top-down" cleaner through the PCV valve, which works remarkably well. I also try to get my gas from the same gas station every time, not only to keep the contaminant variable down, but also to help with mileage issues; since you pointed out that gas does vary, and most gas stations use the same supplier to their stations, as in one gas station uses the same supplier, but another one may use a different one. Strangely, Kangaroo and Marathon both use Eagle as their distributor, at least locally.
I follow the heavy-duty recommendations for my car as much as possible, every 3k (or so). Factory recommendation is 5k.
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