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99b 200hp EFI Merc

john

Contributing Member
" I have a 99' 200hp merc

" I have a 99' 200hp merc EFI and i'm wondering what octane of gas is best for this motor? I know alot of my fishing buddies are using 87 in these newer motors? Is 87 suitable for these high horsepower motors? I always ran 93 but it seems things have changed. Also i would like to thank tony, joe and the rest of the guys out there for a outstanding job they do in trying to help people out!!!!!!!! Thanks John "
 
Check your manual. I think a

Check your manual. I think all of the newer motors can run on 87 octane if it is not listed as needing the higher octane.

Good Luck and Have Fun on the Water
 
" all current engines are set

" all current engines are set up for the 87 octane gas except mercury racing engines, no need in wasting all that extra money on high test.

have a great time boating and enjoy the outdoors "
 
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