In a small boat , esp on a trailer , most times the fuel saved by the trawler crawl is minor.
The lower cost and great livability of a common IO boat in that size is fine for summer use. The 20+K is useful as a 25 fter is no place to be if it kicks up.
We have a Regal 23 with a Volvo (Chevy engine ) that does well with the trawler crawl , great for shallow water looking at the homes and scenery ashore, yet it can be opened up to run rough water at dull spots.
With a trailer real Distance will be 15 -30 mpg behind the tow , so fuel cost is minor as distances covered is minor.Florida is 3 easy days away, instead of 20 expensive , but interesting days away.
$7K if you want the Regal, in Middletown CT , on a trailer , ready to go.