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I've seen 72 GPS under ideal conditions (sea level, 65 degrees, 1-2' chop), 3/4 tank of gas. I run 28P Bravo props and it has punch almost everywhere through the RPM range.
Only modification on my boat is removal of the Silent Thunder box, and I believe the 1-2 MPH gain I saw from that is related to less weight over the drives, not due to any significant improvement in exhaust flow...but it sure does sound nice.
IMO the 292 is a great performer for only having 320 HP per side; the Formula hull design is very efficient compared to some other makes, and nice attention to detail in the finish and creature comforts.
Prior to buying my 292 I drove other boats in this size range, but with the H.O. 496s and a conventional V-Bottom they weren't much faster...and they see the fuel dock more often!
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