Fuel Burn

Korkie

Active Member
Feb 2, 2016
1,329
Leonardtown, MD Potomac River / Chesapeake Bay
Boat Info
2006 340 Sundancer, Garmin 7610, xHD 24 Radar, VV703, SeaStar Hydraulic Steer, Shadow Drive AP
Engines
Mercruiser 496 Mags
Bravo III Drives
I know I have read about this several times, but like anything else - cannot seem to find it now. 496mag B3 drives 2006 340. Reference fuel usage. I used to cruise at 3250-3300 and that would put me at or around 30-31mph and burn according to the SmartCraft @ .9mpg Seems now (just this year), to maintain the 30, I am needing to run at 3400 and am burning .7mpg. Would new plugs be first thing to do? I didn't change them last season, but did the season before. I hear different opinions that I should get at least 300 hours out of a set, only about 100-125 hours on current set, others say less and still others change seasonally. Opinions from those with same/similar setup greatly appreciated. Only 3rd season with boat and love it. Learning to keep these motors at as close to 100% as possible is quite a learning experience. Thanks in advance.
 
Additional weight added and cleanliness below the waterline should not be overlooked.
 
Thanks for the reply's - Changing out plugs this weekend. Boat is lift kept, so bottom clean. So far as weight, could be a factor as she is full of fuel. Getting ready for a 10 day trip, so trying to get the best I can. Always been at .9, but usually with 1/2 the fuel on board. Didn't think it would make that much difference. Will see what happens with the new plugs.
 

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