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Less fuel being pumped into the engine yields less BTU's of energy available per revolution of the engine.
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Correct, refer back to the first post. If you need say 8kw of power to cruise at 60km/hr and that originally occurred at 1500rpm, you are now going to need to cruise at say 1700rpm during lean-burn to output the same amount of power (energy) and therefore cruise at 60km/hr.
Now tell me something I don't know.
