Honda Insight
Purchased 2020 Honda Insight Touring in July 2020 and was getting around 48 to 50 MPG average, then November came and temperature dropped to 60 degrees Fahrenheit (from 80-90), my MPG dropped drastically to 37, now it's about 20 degrees Fahrenheit and I'm getting 34 to 35 MPG. My driving hasn't changed. Is this normal? I called my service department and they said it was because of fuel additives they add during winter. My old Prius never had such a noticeable change, maybe 1-3 MPG difference.
I even tried 93 octane, but that made no difference.
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