How much motor enough on a 20 sceptre

[Ryank]

Hi there, ive got a 20 seafari which i think is just a bit heavier .Ive got a newer 130 johnson , on it at 4300 im running 27mph burning 6.5 gph , at 5200 im running 32mph burning around 8.6 gph I
havent topped the motor out which I guess is around 6100 or so , currently using a 15" 17 pitch prop. . Im sure youd be a bit faster with the lighter hull.Hope this helps a lil bit.