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Something that wasn't touched on here is the possibility of the engine running more efficiently at the higher speed (higher rpm) than the lower rpm.
It could be the engine "coming on the cam", getting the best scavenging from the exhaust, both the tuning of the intake/exhaust plumbing, thermal dynamics inside the combustion chamber...etc.
Makes sense to me to have a target rpm range where a typical engine runs the most efficient...especially if this engine is connected to a CVT transmission...which isn't the case here, but just saying...
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