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About four years ago, I tested our Gen-1 and Gen-3 using up to E85. I found that mixing E50 worked without the check engine light. Above this ratio, the error code was a mixture limit (if I remember correctly.) Regardless, the car worked with the spark advanced due to the higher octane rating. I had one start failure on a freezing temperature morning but the second attempt worked fine. Unfortunately, I found it impractical.
The retail price for E85 was significantly higher than the wholesale price of gasoline at 15% and ethanol at 85% ratio. This made E85 too expensive to use versus E10, the cheapest.
Bob Wilson
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2019 Tesla Model 3 Std. Range Plus - 215 mi EV
2017 BMW i3-REx - 106 mi EV, 88 mi mid-grade
Retired engineer, Huntsville, AL
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