Those OX66 yamahas are great engines, and probably aren't too bad on gas on a V20 if propped correctly.
I know three people who own them.
Good luck with the sale.
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1985 Wellcraft V-20, Evinrude ETEC 150: SOLD
1979 Marine Trader 44, twin Ford Lehman 120s
2006 Panga 14, Tohatsu 20
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