Well our 115 Yammy SWS 2010 engine is still using around 1L per km. Going in for a service in a week. Hopefully they find something as i've tried 5 props now and nothing seems to change. 

I have a 97 stabi 550 fitted with a 2007 90hp Evinrude Etec. i have kept a log of the fuel used over 175 hours.

My old engine a v4 90 evinrude would swallow 20 litres per hours, the new engine averages 8.5 litres per hour, however I would add that i dont very often go above 4000 rpm.

I dont do harbour fishing always out to sea, mayor, motiti, shoals etc even been to white ( out of whakatane) also i do trolling when ever possible, however this figure includes water sking nad biscuiting.

Went out last week to the shoals then on to Motiti doing some trolling and back to sulphur, looking at the fuel guage I reckon i used 30 lites with a running time of  7 hours.

I am confused, all this talk very impressive sounding fuel efficiencies. If this thread is to be of real benefit do we need to see how different motors given the overall picture, ie total distance covered, POB etc. How else can one make a fair and resonable comparison between rigs, motors etc. Most of us have a chartplotter which gives us the distance covered, and the fuel usage can be got from the fuel computer or when you fill up.

Can not find any one witha similar motor to compare.

i wouldve thought about 25-30litres p/h for that motor. so considering its pushing a LOT of weight in this instance, your numbers look very reasonable.

730 Rayglass centre console

 Tip'' it only matters that you have enough in the tank to get back Home..

yup - the hondas and suzuki 90s seem to be doing about 0.6-0.7l/nm

letsgetem wrote: OK. Note previously I have been using nautical miles - but now changed to kilometres - I think its time nautical caught up with metrics! Date:22/3/13 Boat: Frewza F14 - aluminium Size: 4.1m Weight: approx. 470kg incl motor/ fuel, I person, gear Engine: Honda 50hp 4 str Prop diameter and pitch: don't know Weather conditions: about 10 knots wind, low swell - average speed about 28km/h general usage : bottom fishing Hours on water: not sure Distance travelled: 29.8km by gps Fuel used: 6.2L Fuel rate : 4.8 km/L Very economical boating - fuel cost just $9!!!

For some of us with older less technologically advanced rigs is there any way to hire a fuel flow meter for a day or weekend to get some accurate figures together?  I would like to utilize the most efficient cruising and trolling RPM's and testing trolling efficiency out of a tote tank doesn't seem the most efficient means . I do realize that it's probably time for an upgraded outboard but finances inhibit that at the moment and I would like to get the most out of her while I can.