Realistic top cruising speed for Nordic 42 ?

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I agree.

At 9 kts my QSC 8.3 540 hp is burning around 8.3+ gph. At 8.5 kts (1600rpms) I am burning exactly 7.7 gph.

Yes more like it. My boat which is very efficient for its type with twins and 46.8 ft LWL fine entry 32,000lb SD gets 6/gal/hr at 9k which is just within my hull speed.
 
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