• If this is your first visit to the iboats.com Boating Forums, be sure to check out the FAQ. To post a question or comment, begin by signing up. To start viewing messages, select the forum that you want to visit from the selection below.
  • ALL iboats Forum Members and Guests:
    To show our appreciation for your participation in the Forums, we're offering an exclusive Forums-only discount good for an additional 5% off your iboats.com order for a limited time.
    To redeem, simply call our Customer Service Team at 800-914-1123 (Open M-F, 9am - 8pm Eastern Time) and mention the Forums 5% off discount. Offer excludes engines, trolling motors, and electronics.

Announcement

Announcement Module
Collapse

Help Tip: If you have a question that has not been answered to your satisfaction in the archives, it is always best to start a new thread of your own. By starting your own thread, you will receive the maximum number of views by forum members.

Below are some additional forum policies in hopes of all iboats members will follow, Thank you.

1. Please do not reply to old threads or hijack existing threads. Old threads of a technical nature are like a library book, Please do not write in them.

2. Old threads should be considered archives and used for reference only. Please do not reply to them.

3. Do not take over someone elseís thread (aka hijack) with your own question, even if it is similar. If you have a question that has not been covered to your satisfaction in the archives, it is always best to start a new thread of your own.

4. If you have a question for the original poster (OP) and the thread is over 30 days old, send the OP a PM, he may not even visit the forums any longer, or may not notice your question in the old thread.

5. By starting your own thread, you will receive the maximum number of views by forum helpers that may not even notice your question when itís posted at the end of someone elseís thread. And those answers will be specific to your particular issue.

6. Please do not post to threads that have been inactive for more than 3 months unless you are the original poster. We have very active forums and any thread that remains inactive for that long should be considered "dead". It is especially confusing when there is an entirely new question posted to an old thread.

7. Posting at the end of any thread is considered to be hijacking the original posters thread which in turn subjects the thread to be closed if it continues to happen thus not making it fair to the original poster in the future had for some reason he/she needed to return for additional information or provide an update of the problem solved which is always welcomed within a reasonable amount of time frame.

8. Please note that you should see a red banner pop up near the bottom of each inactive thread asking you not to reply to old threads. The Red banner will read: Please note this thread has been inactive for 90 days. For the best results, please start a new thread.

Thank you all in advance for doing your part in helping iboats run a smooth ship.

Additional forum rules linked below.
http://forums.iboats.com/forum-rules-guidelines-405/
See more
See less

Why does my 1996 Mercury 115hp outboard use soooooo much fuel??

Page Title Module
Move Remove Collapse
X
Conversation Detail Module
Collapse
  • Filter
  • Time
  • Show
Clear All
new posts


  • Why does my 1996 Mercury 115hp outboard use soooooo much fuel??

    First time boat owner... have taken my 18 foot baron out on the ocean... very smooth day... maybe 6km tops past Garden Island which is probably 12-14 miles from where we launched... we have used what I think is an incredible amount of fuel??? 60 -65 litres.... is this to be expected from a 1996 engine?? Averaged around 20 -25 knots cruising. Any ideas what could be causing this??? Any help will be appreciated.


  • #2
    Re: Why does my 1996 Mercury 115hp outboard use soooooo much fuel??

    Welcome to the world of boating. 15 gallons for 40 or so miles. Sound pretty good.

    Comment



    • #3
      Re: Why does my 1996 Mercury 115hp outboard use soooooo much fuel??

      How's the compression on the motor. Lower compression = higher fuel consumption because the cylinders do not hold fuel as well as when the are fresh. These motors are roughly 50% efficient when running good. It's just the nature of the beast.

      Comment



      • #4
        Re: Why does my 1996 Mercury 115hp outboard use soooooo much fuel??

        As I recall the numbers, some "Big Guns on here" like to use the numbers 10% of the engine HP rating at WOT in GPH consumption. So, at WOT a 115 would use 11.5 gallons per hour. Soooo based upon the above numbers, you ran at a reduced speed but for 2 hours and consumed 15 gallons; 7.5 gallons per hour. Sounds about right to me.

        Mark
        If you are new to boating or have a new boat, a knowledgeable friend could show you how to operate your boat and save you a lot of grief, maybe some money, and maybe your life.

        Comment



        • #5
          Re: Why does my 1996 Mercury 115hp outboard use soooooo much fuel??

          Originally posted by Texasmark View Post
          As I recall the numbers, some "Big Guns on here" like to use the numbers 10% of the engine HP rating at WOT in GPH consumption. So, at WOT a 115 would use 11.5 gallons per hour. Soooo based upon the above numbers, you ran at a reduced speed but for 2 hours and consumed 15 gallons; 7.5 gallons per hour. Sounds about right to me.

          Mark
          Agree and for an older motor like this, that's not too bad at all.

          Comment



          • #6
            Re: Why does my 1996 Mercury 115hp outboard use soooooo much fuel??

            Expect 2 to 5 mpg on a boat.

            Comment



            • #7
              Re: Why does my 1996 Mercury 115hp outboard use soooooo much fuel??

              I think your fuel consumption numbers are great for an "old" 2-stroke.

              (I put "old" in quotes because to me a motor isn't really old unless it's older than I am )

              Comment



              • #8
                Re: Why does my 1996 Mercury 115hp outboard use soooooo much fuel??

                depends too on how many POB you had,
                the baron is a fair size tub too,
                bit confused though...changing from K's to miles will do that..and l remember when we used imperial measurements,
                so you did around 27 k's one way and used 60-65 lts or did ~54 k's return on the same amount of fuel?

                my son has a 120 and will use that much pulling tubes and hooning around..

                of course, if you're in Sydney, the water is MUCH,MUCH harder to push through coz of all the "stuff" in it
                LOL
                happy little vegemite

                Comment

                Working...
                X