We have a 2000 Grady marlin w/o a gen set , powered by a pair of F-225 Yamahas. Currently have stainless three blade props , not exactly sure of diameter but seem to be 15 or 15 1/4 x 17. Boat seems to do well , just wondering if anyone was using some thing different along with some numbers. Ours likes cruising at 3800-4000 rpms and 20-22 knots while burning 1.5 to 1.8 per gallon depending on our weight and sea state. These numbers are according to Yamahas fuel management gauges and verified at fill up. Any tips would be greatly appreciated.
