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  1. #1

    These 300s are thirsty

    Coming from a 4-tec NA 155HP to this 300 I knew would use more fuel but geeze it feels like 2x sometimes. Other than being more conservative on the trigger finger has anyone found any mods/tunes that seem to help in this area?

  2. #2
    Click avatar for tech links/info K447's Avatar
    Join Date
    Jul 2007
    near Toronto, Canada
    300 is roughly twice as much maximum power as 155...

    What percentage of the time are you squeezing the throttle hard?

  3. #3
    Getting 2-3hrs on a tank from what I can tell. Hour meter on these new boats only increment every hour so hard to tell sometimes. My old boat recorded to the tenth of an hour which was nice.

  4. #4
    I have a 2010 RXT-X 260 with V-Tech 8350 tune, VT1100 injectors and it loves fuel at high speed. Amount of HP is related to the fuel consumption.....

  5. #5

    Join Date
    Apr 2012
    Troy, MO
    I almost ran mine out on a 45 mile ride. Came back with no bars at all. Rode like that for about 5 miles. Sketchy for sure. I was racing a few boats on a cruise down the Mississippi River. Ran a best of 83 on the dash though. I only put about an hour and 15 minutes or so on that tank.

  6. #6
    Xspook's Avatar
    Join Date
    Jan 2014
    Space coast, FL (Brevard County)
    Quote Originally Posted by Jwall View Post
    . Came back with no bars at all. Rode like that for about 5 miles.
    I recently returned with no bars showing...was riding with a buddy in case it died. Still haven't filled it back up to see how much it will take with no bars.

    With 1 bar, there is about 4 gallons in my 15.9 gallon tank.

  7. #7
    At 2 bars the low fuel warning first comes on. I have filled it twice now right when the warning comes on and put 11.5 gallons in it each time. This is pretty close to the manual which I believe states you have about 4 gallon left when first low fuel warning comes on.

  8. #8
    Join Date
    Jun 2009
    SO CAL
    I get around 45min of ride time on a full tank

  9. #9
    moparguy's Avatar
    Join Date
    Sep 2016
    Niagara Falls, Ontario
    Quote Originally Posted by WICKEDSEADOO View Post
    I get around 45min of ride time on a full tank
    My average fuel consumption is about the same, dash says 60l per hr. Not to sound gruff but when you purchase a top tier performance machine, you are not looking at fuel economy and if you are you shouldn't be looking at a machine like that. We dont have these machines for their fuel economy, we have have them because of what they are capable of. Pin it to win it!!

  10. +1 by:

  11. #10
    boost junkie skidoochris's Avatar
    Join Date
    Mar 2012
    Davison, Mi
    you should try using e85
    its seems like twice the fuel use
    its actually over 1/3 more than a 260
    but 100+ octane @ $2 a gal
    you just keep extra cans around

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