350 Merc Horizon 6.2l Fuel Usage

[Scottvr26]

I have recently upgraded from a 270 to a 2005 320 with 6.2l V-Drives. The question is what are you guys getting for Gph. I have been getting 30 GPH at around 3800 rpm going about 20-21 knots. Trying to figure out what the best speeds are to attain the best economy.

Thanks