I know mine is a two stroke, but I've run av gas for over a year with no problems and can't tell a performance difference. A lot of people don't like it, but I can get it for less than 2bucks a gallon and it readily availabe. I will be doing some drags tests with it at the track next year to see #'s on if there is a performance difference between it and race gas.

 

Ultimate-4, all the way. Even on two-strokes!!!

 

How much is that stuff per gallon, in the long run wouldn't you be better off going to methanol?

 

Sam, I checked into MRX01 a while back. It's $79 for 5 gallons then. I'd be scared to see what it costs now. It's also only 2.55% oxygentated. The Ultimate 4 is 6% oxygenated.

 

dave i found a station right by the house that sells 100 and 110 ,the station you had mentioned,are you running the 100 straight ..
Would the 100 plus a little of the 110 bring up the octane level or is that all wrong ..?

 

I'm curious what I should be using. I didn't bore it, just have a 13:1 high compression piston, port and polish, and a stage 2.

 

In theory mixing 50/50 with 100 and the 110 will give you 105 octane. 76 somtimes has a mixing chart they'll give you. Yes I am useing the 100 strait.

 

JCD, I would run 105 octane or more, jmo.