Sorry, I have the efficiency maps for all the engines we produce, and what you say is rubbish, whether you think you can 'guarentee' it or not! Lugging an engine too slowly may not be the best way forward (usually OK straight and level, not on grades or with headwind), but that's different to getting better FE at 5000rpm to 2500rpm! Most gasooline engines are most efficient at 1500-2000rpm. Besides as many smaller engine have variable cam timing these days, its not even set to the eak torue setting at part load cruise, its usually set to the max power setting to make the pump 'inefficient' so it reducves pumping losses past the throttle as the throttle has to be further open to compensate!
Simon
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98 S-turbo, next mod decat D/P and hybrid turbo!
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