Ok so now I have the bug for a Starcraft, thanks to CheapboatKev, North Beach and Andy in NY.
I have read that the 120 HP Mercruiser really sips the gas, I have a 1973 50 hp Evinrude and a 1984 90 hp Yamaha both outboards and they guzzle the gas. Both use three plus gallons on a ten mile round...