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FWIW, the advice I have been given (and have been following) is to reduce MP (or RPM I suppose, although that is not what I do) to get the book fuel flow. If you use book MP/RPM settings with intercoolers, you will be developing more HP, including higher cylinder pressures, than the engine was designed for. 'Course, if you use 65% power MP and get 75% power fuel flow, you are OK, you are still at or below 75% power.
On my airplane, this results in book fuel flow at 63% power being 2" MP lower than book. This is operating 50 degrees rich of peak on the first cylinder to reach peak (#5 on my airplane, both engines). Fuel flow is verified by actual fuel consumption, not just fuel flow indicator. So I use 27"/2500 RPM for 63% power cruise.
Kevin
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