175
I have an E-tec 175 on my 21- only have 22 hrs. on it but the one time I clocked it, with 95 gallons of fuel and two people on board, I had a 24 kt cruise and top end of 31 kts. Now I used to have a 200 Opti and there is a noticeable difference at top end but since I fish the ocean and rarely run at top end I traded off for much better fuel economy and a quiet reliable engine. My two cents would be that with a 23 those numbers would be hard to attain that he's claiming.
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