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  1. #31

    Re: Stndard or super fuel pros and cons

    I think heís saying heís getting better mileage on 91.


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  2. #32

    Re: Stndard or super fuel pros and cons

    No I saved fuel on 91 not premium itís a 115 Yamaha nearly 10 months old pushing 200 hours


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  3. #33
    Ausfish Silver Member
    Join Date
    Jun 2016
    Location
    brisbane

    Re: Stndard or super fuel pros and cons

    Quote Originally Posted by Jason Green View Post
    No I saved fuel on 91 not premium itís a 115 Yamaha nearly 10 months old pushing 200 hours


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    well there u go.. ive never extensively tested it.. of course all we have to go on is the fuel companys pushing it on us.. maybe in some cases some and i say some people get more on 98.. but thats awesome u get better fuel economy on 91.. as said i dont know enough to tell someone theres no benefit of 98.. but for the bloody price lol i am happy with the performance and cost of my 91 which i use on my car mower and boat.. and all my engines last a long time..
    ill be somewhere up the creek, happy trails..

  4. #34

    Re: Stndard or super fuel pros and cons

    The benefit of higher octane fuel is its resistance to knock and ping nothing more, nothing less. My new 8hp yami 2 stroke manual says to use a min of 90 and if knocking and pinging occurs to use a different make of fuel or higher octane fuel.

    The links I posted on the previous page also highlighted that synthetic fortified oils fall out of suspension when used premix in 91 octane fuels, but apparently no so with 95. No problem though if you don't use synthetic or synthetic blend 2 stroke oils.

    And in relation to a previous comment - I'm not so sure drag cars run lean mixtures - top fuellers are on the verge of hydraulicing they run that much fuel through the engine.

  5. #35

    Re: Stndard or super fuel pros and cons

    There are many who run 91 and there are many who run 98 and everyone has some good and bad results.

    I personally have a 2000 Model 115hp Johnson Oceanpro (2 stroke) and very happy with the use of 95.

    There is mounds of literature for and against different fuels in different size outboards. I guess itís what makes you happy that counts. Each to their own.


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  6. #36
    Ausfish Silver Member
    Join Date
    Jun 2016
    Location
    brisbane

    Re: Stndard or super fuel pros and cons

    Quote Originally Posted by shakey55 View Post
    There are many who run 91 and there are many who run 98 and everyone has some good and bad results.

    I personally have a 2000 Model 115hp Johnson Oceanpro (2 stroke) and very happy with the use of 95.

    There is mounds of literature for and against different fuels in different size outboards. I guess itís what makes you happy that counts. Each to their own.





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    thats it shakey use what makes you happy in life and if others dont agree/like it well just do it your way.. dont verbally beat some1 up,, if i had a bigger hp engine like you id use 95,, as for me a run a 9.9 so me 91 does the trick just sweet....
    ill be somewhere up the creek, happy trails..

  7. #37
    Ausfish Silver Member
    Join Date
    Jun 2016
    Location
    brisbane

    Re: Stndard or super fuel pros and cons

    Quote Originally Posted by juggernaut View Post
    The benefit of higher octane fuel is its resistance to knock and ping nothing more, nothing less. My new 8hp yami 2 stroke manual says to use a min of 90 and if knocking and pinging occurs to use a different make of fuel or higher octane fuel.

    The links I posted on the previous page also highlighted that synthetic fortified oils fall out of suspension when used premix in 91 octane fuels, but apparently no so with 95. No problem though if you don't use synthetic or synthetic blend 2 stroke oils.

    And in relation to a previous comment - I'm not so sure drag cars run lean mixtures - top fuellers are on the verge of hydraulicing they run that much fuel through the engine.

    just a thought and could be wrong... but yamaha use 100/1 mix tohatsu and mecury 50/1 ... i dont care what motor i run i always go 50/1 (back of hippies or ill turn ya power off if i cant have me 50/1 lol) so the point is just cos yammie says there engine can handle 100/1 ive always run smaller engines on no less then 50/1.. maybe if its knocking and pinging uping the 50/1 mix may help... as said could be wrong but my motors on 91octane and 50/1 have never knocked or pinged,, just a thought to throw into the mix.
    ill be somewhere up the creek, happy trails..

  8. #38

    Re: Stndard or super fuel pros and cons

    98 over 91 is 15-20% more here in the bush you are not going to save that same percentage in fuel use between the two

    98 has cleaning detergents added its probably just giving a dirty engine and carb a clean

  9. #39

    Re: Stndard or super fuel pros and cons

    too small a sample size
    could have just been other factors on the day
    bimini up and down
    wind behind you
    flat surface v small ripples

  10. #40

    Re: Stndard or super fuel pros and cons

    Quote Originally Posted by stevej View Post
    too small a sample size
    could have just been other factors on the day
    bimini up and down
    wind behind you
    flat surface v small ripples
    Hi stevej if youíre talking about my comment conditions have been the same as usual if not worse on the last few trips I have done and itís still saying my fuel economy is running better on 91 I donít know why but anyway it is
    Usual day trip is 150-200 km
    Roof doesnít change bit hard folding it down and driving
    Weight is usual except the last couple of trips heading out into 10-15 knot northlies with 4 foot swells at 4 seconds on a outgoing tide which is not real comfortable at the top end of Hervey Bay but I have been locking the ballast tank off keeping 150litres of water on for extra weight for the trip out which makes a big difference in comfort but does burn the fuel
    I donít know why it is doing better but anyway itís saving me a bit on fuel money for more beer
    When I get decent conditions to open her up next I guess I will be able to see whether there are any changes at wot


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  11. #41

    Re: Stndard or super fuel pros and cons

    Jason wasn't aware of the large trips you were doing, any dollar saved is a bonus

  12. #42

    Re: Stndard or super fuel pros and cons

    Quote Originally Posted by TheRealAndy View Post
    At least that part is accurate.
    I haven't checked in for a while so I just noticed the critique of my post.Thanks for confirming my admission of limited fuel science knowledge and possibly you could clear up all the other inaccuracies in my post for me so that next time someone asks for thoughts I won't make the same mistakes.

  13. #43

    Re: Stndard or super fuel pros and cons

    this is my experience. Putting 98 instead of 91 does no harm to motor. Putting 98 in costs more, gives a slight boost to the performance does increas range slightly. No where near 10% improvements. On a cost basis, pay more go further, its a zero sum gain. Now if your motor is tuned to run 98, you would be crazy not to take advantage and. 10% gain has been factored in by design. Does 98 go off faster than 91? No idea but i have never experienced bad fuel either.
    my take is that its just not worth it long term. Short term, hey it doesnt hurt and may clean up the insides a bit.

  14. #44

    Re: Stndard or super fuel pros and cons

    Quote Originally Posted by Andy56 View Post
    this is my experience. Putting 98 instead of 91 does no harm to motor. Putting 98 in costs more, gives a slight boost to the performance does increas range slightly. No where near 10% improvements. On a cost basis, pay more go further, its a zero sum gain. Now if your motor is tuned to run 98, you would be crazy not to take advantage and. 10% gain has been factored in by design. Does 98 go off faster than 91? No idea but i have never experienced bad fuel either.
    my take is that its just not worth it long term. Short term, hey it doesnt hurt and may clean up the insides a bit.
    Agree.
    I reckon I got around 10% more range on every modern motorcycle I have owned and done the standard commute day after day. The XR had something like a 9 litre tank so I really noticed it there. Boats - dunno...probs not.

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  15. #45

    Re: Stndard or super fuel pros and cons

    The higher octane fuels are more refined and have more stable hydrocarbons resulting in the ability to reduce octane loss and vapor pressure loss over a longer period of time. There is one answer to this conundrum, if you use your boat frequently 91 is OK, but if stored for any period then a higher octane would be preferable. Most motors benefit from going up to the next octane level but generally no further and would be considered a waste of money. There is also other factors involved but it starts to get complicated especially if you start comparing carby 2 strokes vs 4 strokes and even newer 4 strokes vs some old ones.

    Best way is to test for your selves and be happy with your decision. I know of people where the pennies are tight and will always go the cheapest (except E10) and that is fine with me, others have done some research and have their opinion, fine with me also. I use 95 after talking with mechanics, both car and outboard, a mate who works in the fuel industry and another who is an industrial chemist so I am happy with my decision. ☺

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