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Lean burn can be finicky in my HCH. If I drive 60mph I can maintain it indefinitely as long as there is no significant grade. But at 65mph it almost never uses lean burn. If I were to gently accelerate from 60 to 65 it will stay in lean burn, but once it's pushed out it won't go back in. The Scangauge is very helpful in maintaining lean burn. I find that as long as I keep engine load under 90 it will stay in lean burn, and if it gets forced out I can usually resume lean burn by dropping the TPS under 20.
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