I’m waiting to see real-world data before making any changes. My car is newer so it should handle E15 fine, but I want to see if anyone reports actual mileage differences.
Great responses everyone! @david_johnson you’re absolutely right about maintenance – that was one of my biggest surprises. @lunalee106 I see your point about individual circumstances, but I think the percentage rule is still a good starting baseline. You can adjust from there based on your specific situation.
