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"The proposal for Coast Guard Cutter use would be to eliminate the gas turbine and the combining transmission, and just go with diesel power.
You'd lose the top end of the DCS, but would increase range and endurance by eliminating the gas guzzling turbine while still reaching 20 knots which is what most Coast Guard Cutters do today."

Max speed of both Freedom & Independence class LCS's is limited by problems -- with gearing on Freedom and structural cracks on Independence.
Somewhere I heard their max speed is now just 15 knots.

Legend class Coast Guard cutters are listed as 28 knots, max., with a range over 12,000 miles versus the LCS's 3,500 miles.

Somehow, I just don't think the Coast Guard will like those LCS's.

Legend class Coast Guard cutters are listed as 28 knots, max., with a range over 12,000 miles versus the LCS's 3,500 miles.

The Coast Guards new OPC has a max designed speed of 22.5 knots, with a 10,000 mile range at 14 knots.

https://www.dcms.uscg.mil/Our-Organization/Assistant-Commandant-for-Acquisitions-CG-9/Programs/Surface-Programs/Offshore-Patrol-Cutter/

I wouldn't speculate on the range of a diesel-only DCS hull, but removing the gas turbine and trouble-prone diesel-gas turbine power combining gearbox, extra fuel storage could be provided.

And keep in mind that the idea (not mine, really) is for the DCS to replace just some of the planned 25 $411 million OPCs. You can do a lot of modifications with a $400 million budget when you get the hulls for free.