This is why its hard to hold lean burn as the ecu has a purge cycle built in to try to keep the smog in check. I believe the engine engines like the one in the Fit, Insight and other honda vehicles run leaner vs having a mode to give better over all fuel economy and lower end torque.
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Originally Posted by Daox
Lean burn has issues with increasing NOx emissions, which is a pretty nasty thing that causes smog and acid rain. The rest of the emissions are likely lower due to the increased efficiency.
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