Hi I have an 07 Yamaha 80 4 stroke this has probably been asked before but when I use my boat regularly I mix it up between low and high octane fuel haven't used my boat for 6  months or more longest ever I've been of the water anyway got all the old fuel out today and put in the mower and misses car Haa what are people putting in their 4stokes  and y or not thanks 

Faulkner Family's picture

Posts: 15534

Date Joined: 11/03/08

 in got a 140 4 st 06 suzi

Wed, 2018-08-15 20:24

 in got a 140 4 st 06 suzi and just run reg ulp. no probs. couldnt realy justify spending the extra when not needed, altho some newer motors reccommend using the hi octane stuff


RUSS and SANDY. A family that fishes together stays together

Rob H's picture

Posts: 5188

Date Joined: 18/01/12

DF115's, regular ULP, just do

Wed, 2018-08-15 20:31

DF115's, regular ULP, just do not under any circumstance no matter the price use any ethanol blends, ESPECIALLY if the boat is left standing


 Give a man a mask, and he'll show you his true face...



The older you get the more you realize that no one has a f++king clue what they're doing.

Everyone's just winging it.


Stevo81's picture

Posts: 1197

Date Joined: 16/04/12

 06 f150s. Just use regular

Thu, 2018-08-16 05:55

 06 f150s. Just use regular unleaded which is 91 octane. My Yamaha owners manual specs minimum 86 octane.

Spend enough on fuel as it is without paying $1.79 a fkn litre or what ever premium 98 is at the moment 


                                   ••••••••  Electrical Contractor NOR  ••••••••

ChrisG's picture

Posts: 550

Date Joined: 30/12/11

 Usually pick the middle of

Wed, 2018-08-15 23:32

 Usually pick the middle of the three available at my local servo..which is 95. I’ve never used 98 but have used 89/91 a lot when out bush. When first got motor I ran a couple of tanks of 91 verses 95 to see if any differences in economy and power because I 100% get fuel economy in the Missus car when using premium

 (did on river to take swell and current out of the equation and with just 1 POB)....at time I convinced myself at 18-20Kts I got a bit better than 1nm per litre using 95 and a little less using 91. Nowadays on big runs with two big blokes on board, Eskys, ice and every item that tackle world sells all on board I’m less convinced it make a noticeable difference whatsoever....

in fact when out bush I always choose normal ULP not premium as I’ve seen guys get a tank full of shit fuel when buying premium as the country servos just don’t turn over premium often enough and it’s often ages old and full of water especially in hot humid towns up north.

Ryan C's picture

Posts: 1574

Date Joined: 08/07/10

2017 140 suzuki

Thu, 2018-08-16 06:10

 i mix it up a bit , but the 140 Lean Burn on my Barcrusher seems to be a bit more snappy on 98 RON .

Posts: 672

Date Joined: 22/07/10

 Run some Yamaha “ring free”

Thu, 2018-08-16 08:08

 Run some Yamaha “ring free” or get some Petrol enhancer like that ifish flogs.

Anyfishwilldo's picture

Posts: 788

Date Joined: 09/02/14

I have a DF80a and have only

Thu, 2018-08-16 08:35

I have a DF80a and have only ever used 98 RON, run 91 in my SS. 

backlash's picture

Posts: 284

Date Joined: 12/10/10


Thu, 2018-08-16 14:10

I always ran/run BP Ultimate; or 98 octane if the BP is not available
when you think about it - fuel is (relatively) cheap in the scheme of things; and I have burnt a lot of it during my gamefishing & barra trolling days

Posts: 186

Date Joined: 25/05/10

 Dont try diesel, tried it

Thu, 2018-08-16 18:22

 Dont try diesel, tried it once didnt work.