Another Propeller question

MasterBaiter

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Hello all,
I know another prop ? I`m sorry ....but I`m at a loss,I have a 1989 Grady Gulfstream powered by a 250 hp mercruiser w/Alpha 1 Gen 2 outdrive.
My problem is twofold, I am unable to find what diameter size is used on this outdrive,And whith this forums expirence what would be the best pitch prop.
I use the boat for fishing mostly,with trolling involved but I also like to cruise as my fishing spots are somewhat remote.I have trim tabs,Ive tried 141/2 dia 19p
141/4 21p but still consumes ALOT of fuel 1gal per mile...This is with a newly tuned running smooth as silk engine.trimmed ect. Please any help would be greatly Appreciated
 

jekyl

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The only experience I have with inboards was my old 454 merc and bravo 2 leg and i'm fairly sure the prop was 19" diameter not sure of the pitch.