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Something is very wrong.

Based on some research I am guessing you have the 225 Optimax engine? Confirm?

What is the fuel load with the performance reported?
Does the boat:
Was engine trim used?
Does the boat have trim tabs, were they deployed?
Does the boat have a T-top?
Does the boat have bottom paint? Condition rough or smooth?

Were the fishlockers plugged and dry?

What was the passenger and gear load?

In reviewing web search results, your top speed tracks (estimated WOT of 36 mph) based on extrapolating other 240 Outrage owners with different engine setups, (i.e. twin 150's got 50mph).

What does not track is your GPH burn, It reads as very high so I suspect the engine is not operating correctly. Have you had it serviced by a Factory trained tech. Pulled the codes?