After all these great posts and wonderful information, my owners manual still says
to use 91 octane plain and simple.!!!!!


Saint

 

lost one: i would agree with and i totally understand carbs half the time it is the automatic choke adjustment plays into it also.
I also completely inderstand detonation and what causes it but thank you for the information.
next time we can have a conversation about gear oil in the tranny vs syn3 or any other vtwin 20w50 oil.

bosnmate: thanks

st john: yes it does since it is the easiest fuel to burn in Vtwin but not the best at all times
in the summer i use 91 in the winter 87 i do the same in my boat and mustang.

 

Very true. It's amazing the number of people that somehow think they are getting better gas. Must stock Harleys will run just fine on 89 octane.

 

Ever read about putting acetone (paint thinner)in your gas? Google it and find out. They state that acetone added to your fuel will help it atomizebetter andin turn helps it to completely burn resulting in better fuel combustion. I have used it in the Harley, Duramax and small engines around the house. I gained 2 mpg in the truck and can notice the running difference in the Harley. I add 2 oz per 10 gallon. It makes the molecules of the fuel slippery.

 

you can read just as much saying it won't make a difference and may do harm, here's an example http://www.fuelsaving.info/acetone.htm

 

Then why don't the gas companies already do this?

Seriously.

 

I tried acetone for kicks in 3 vehicles. No measureable positiveresults.

 

Mythbusters tested this. Acetone made performance and mileage worse.

Toluene will increase octane. A google search will turn up the correct formula.

 

.you'd do just as well performance wise by puttin a turd in your tank

So does this mean if I $hit in my gas tank every day , my all stock Ultra Classic will then be HIGH PERFORMANCE!!!!

LMAO

 

Quote:

ORIGINAL: tlb

st john: yes it does since it is the easiest fuel to burn in Vtwin but not the best at all times
in the summer i use 91 in the winter 87 i do the same in my boat and mustang.

Ever notice that your gas milage is better in the summer than the winter. In my SUV on the highway it can vary 2-4 mpg. Reason is simple -- in cold weather the air is denser (about 10-20% or so based upon the "ideal gas law"). So the oxygen sensor calls for more gas. This is the same reason that at altitude the octane of regular gas is lower.