Hm. My Insight can lean burn up to 72 mph on level ground at ~80 mpg in the summer. Haven't driven it that fast in the winter but I doubt I'd be able to maintain speed while lean burning in the cold. I wonder what's causing lean burn not to work well for you over 40 mph? Is this the case with both of your Insights?
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2013 Toyota Prius C 2 (my car)
2015 Mazda 3 iTouring Hatchback w/ Tech Package (wife's car)
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