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The sweet spot in general is 70% throttle, 2500 rpm. this seems to fall in the middle of the place on the BSFC curve where the engine is most efficient. The Brake Specific Fuel Consumption curve illustrates the engines fuel consumption in relationship to the power that it is creating. Lower throttle and you have pumping losses where the engine is wasting energy sucking air past the throttle plate, and higher throttles have the extra power coming from dumping too much fuel in for the power produced, lower RPM and you aren't producing torque efficiently, and higher RPM has the engine wasting energy on friction to maintain the higher rotational speed. Search BSFC and you'll learn more.
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