Its really not that surprising. Most internet sources available list the Balao Class top speed at 20.25 kts. So to manage 22.8, doesnt seem far-fetched at all. Official sources for those kind of things are always below the actual speeds anyways.
real-world first-hand example: My father captains ferries in and around British Columbia, Canada. In the Straights of Juan de Fuca, his GPS speed was 18 kts. (he was flat out), and he plotted the speed of a USN Arleigh Burke (Flight IIa) going past him (using his radar, plus GPS) at exactly 34.6 kts. The official listed speed of the Burke Class Flight IIa is "Greater than 30 kts", with other sources saying between 30 - 32 kts.
That DDG blew our doors off!
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