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Also, leanburn doesn't seem to work well or even at all perhaps with the IMA breaker off.
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I was never a fan of lean burn. I did a lot of highway driving and hated how it would suddenly kick out of lean burn and I'd have to keep feathering the gas pedal to maintain speed until it kicked back in.
When I shut off my IMA it didn't go into lean burn at all, so it was the smoothest highway driving I ever did in an Insight, and I really didn't sacrifice more than a couple of mpg. I did miss the IMA boost, auto stop and start, and the quiet restarts from the IMA battery.