I tried driving with out the instant on (as you most likely know, you can turn it off in the HCH). My mileage was 8-12mpg worse. Maybe if there was a light telling you when you were entering lean burn mode? My whole goal is to stay at 120MPG as long as possible and using the IMA as much as possible. It is working for me so far.
2004 Honda Civic Hybird
"Boring" White
5 Speed
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