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I'm agree with Neon. Anecdote: my motorcycle (Yamaha XT225) comes lean tuned from the factory for (ostensibly) low emissions. The head pipe can glow dull red in the dark. Many fans of the small dual-sport bike tweak the air-fuel mixture for a little more power. They gain a little torque but invariably lose FE in the trade. They're happy with 70mpg but bone stock yields 90 which I prefer.
Lean works. Hyper milers with helium feet are easy on engines by nature so it's good. So overheat is less of a risk. Hot rodders are a different breed...
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