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1) VTEC engages when rpm goes above 2500.
2) Once the engine reaches normal operating temperature, it runs in lean burn whenever the manifold pressure remains above a preset limit (under low load, mostly closed throttle). Lean burn limits are controlled by manifold pressure Usually you can feel a slight stumble as the engine enters and leaves lean burn.
In my car I get better mileage when flooring it in 5th rather than running partial throttle in 4th.
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