Mixing 93 and 100 octane fuel

[2010SHOtime]

I'll be heading to the track on Wednesday with some 104 octane race fuel and a 100 octane tune but don't know how to properly mix the fuel. Do I have to run it to completely empty or get it to 10 miles to empty and then pour in the 100 octane?

 

[panther427]

The lower you get your tank the less it will cost to equal 100 octane.  Roughly speaking if you can get it down to 1/8 of a tank your looking at 2-3 gallons left.  So adding 3 or 4 gallons will net you are 99 to 100 actual octane in tank

2*93=186+3*104=312=498. Divide your octane by gallons

498/5=99.6 octane. 

 

[kinder]

For the sake of a gallon or two do you really want to risk mixing not enough and running with a lower octane rating?

Just sayin'