I just found a gas station a few miles away from my house that sells 100 octane gas, and it got me thinking. I have ~20 gallons of 91 in one of my tanks (45 gallons each). I put that in back on Jan 2nd and the boat has been sitting since (indoors mostly if that even matters). I could put a bottle of the Lucas ocatane booster in the tank (~$11 and treats up to 25 gallons), or put a couple gallons of 100 octane ($8/gallon).

For u gas guru's, is there an advantage to one option over the other? Thinking of getting the boat wet tomorrow. Will be a relaxing day so I wont be railing on it, but was just curious. Any thougts?

Btw, its a blown 540.

Mmmm, nothing like the smell of race fuel in the morning! Go with the real deal.

Fill the tanks full of 100 octane. Good fuel is cheaper than tearing up a motor.

Octane boost = joke
Race fuel = good smell

you will go faster with booster in your tank it says it on the bottle

have no idea what your engine requirements are? power on pump gas is the way to go. buying race fuel from a local station you will find is all over the map. many sell kerosene in the winter from the same pump...it is not regulated because it is ORV fuel....the fuels at the pump are pretty accurate and i think the test results are public from the DOT in your area. this way you can find your local VP dealer and buy 55 gal drums and mix yourself. having consistent fuel you may find you only need 95? i found a VP guy that mainly sold to MX guys and when i was buying hundreds of gallons at a time he was very open to totally giving me a killer deal.

to answer your question you can raise the oct # by all different methods. some better than others. some do the job but leave tons of deposits. VP is now making econo fuel that is designed not to leave deposits like pump fuels do....u may want to check into that!

Majority of octane boost raises Octane POINTS.

There are 10 Points in an Octane Number. Octane numbers are 87 89 93 etc.

So if the can says "increase octane 8 points", added to 87 would be 87.8

The higher the octane fuel added the less the increase

Race gas mixed with regular fuel is much much better, especially for a boat that holds large amounts of fuel.

From my research years ago the best octane boost I could find was the NOS Racing formula octane boost. Increase of 60 points or 6 numbers (when added to 87 octane).

Thanks for all of the great info guys! Im gonna go swing by the station and put in the 100 octane in the morning

X2

Save your money for plugs if you need higher octane.

Assuming it needs 91 octane, I would put 5 gallons of the 100 octane in each tank.

Increasing the octane too much will most likely cause the plugs to foul and will definately make your transom black.