Compression would make a difference. On an older motor, higher octane might help, because the more carbon build up inside the engine the higher the compression will be. But if you have kept it clean with the additives and such then probably not so much.
I have noticed some of the gas corps only put the better detergents and such in the higher octanes, so that may be of a help possibly.
Reply #16
by Curt on 11 Feb, 2016 16:32
My outboard is a 2006/2007 Yamaha 150. It's pre-injection and has carbs. If I remember right, I was told by the dealer to just run regular fuel when I bought the boat new, not high test.
Reply #17
by fishon-son on 12 Feb, 2016 20:24
WELL IM GLAD I MAKE A GOOD LIVING..if the head guy at merc called and said I didn't need super unleaded gas..id still use it...just the way it is for me..im not a man of change..lol
WELL IM GLAD I MAKE A GOOD LIVING..if the head guy at merc called and said I didn't need super unleaded gas..id still use it...just the way it is for me..im not a man of change..lol
I hear ya there. If it's not broken, don't fix it
Reply #19
by JackJ on 15 Feb, 2016 09:34
I don't know about your area, but around here the good additives that help your engine only get put in the premium grade, so that should be a bonus for using the higher octane.
Reply #20
by Curt on 15 Feb, 2016 10:02
Good point Jack! That's part of what makes the higher grade gasoline more expensive.