Re: 78 merc 115 hp
I run the 91 octane no corn oil and the penzoil marine oil mix . 1974 1150. .030 over sized bore wisco pistons . fabuglass 18 foot tri hull #78 jet 19 pitch ss prop. it uses about 1.4 gallons an hour each time i was out for about 4 hours . @ 16 bucks at fill up time . but not going full throttle just crusing around .. with a few burst outs . and stopping to do some fishing . and that penzoil mix stuff is about 11 bucks a gallon . running 40 to 1 mix .max speed so far 45 mph . I am working on tuning it .. but not expecting much more i like to night cruise mosly .
