[Putershark]

Well if you have to ask... My Honda 150 VETC is running 1.89 GPH average as of right now.

How?

1. Running a quick launch 3 bladed Stainless Prop. Such props cut a few knots off the top end speed I agree, but digs out of the water like a Space Shuttle launch
2. Always driven for quick to plane speeds (punching it to get on plane) but mostly ran and trimmed out at minimal plane speeds afterwards as I scout out new waters. Besides, the CD deck sounds much better at lower RPM's
3. High Grade / Octane Fuels (one burns less of the stuff IF the engine is not knocking and pinging
4. Mobil 1 motion lotion in the crank case, and filter mag installed on the oil filter.
5. Low water pick up and BMS plate mounted on the lower unit. Here again, to reduce drag and help get the hull on a plane as quick as possible.
6. Star Tron added to the fuel which helps keep it fresh and the octane from falling while being stored.
7. The hull is kept light so I do not draft as much water.
8. Maximum use of my Minn Kota trolling motor to include running on it instead of the big engine at times in no wake zones. Charging batteries though is much cheaper than pouring in fuel and a matter of fact, the last time time out... I came in on the trolling motor since my last fishing stop was less than 2 miles from the ramp.

This is all tracked in a excel sheet (as many here know) since I posted copies of them for everybody to use... This way you can find the sweet spots for which fuels and which prop combos returns the best yields for "your" boat.
If you don't track such items, trust me you are only guessing at those numbers