I've been experimenting with this. No reasonable data yet as other variables like temperature and weather are having a greater affect on my numbers.
My first tank of E0 bumped me from 41 to 47. I was stoked but I can not account for how much the E0 helped as that week warmed up a bit from single digit temps, and I noticed my driving technique was better also.
My second tank E0 again went up to 49 but, again warmer and I was paying attention to driving more because of the improvement.
3rd tank I went back to E10 expecting to see a drop. But, No. Stayed at 49.
I do believe my car likes it but I will have to do more controlled runs with better data collection like temps to measure any difference. In the meantime I should at least see the average start to come back up. In the spring time. Due to the weather. :-P
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