i've run toluene before. a few times. it wont do any damage to the fuel lines, but it can be bad to have too much added in your fuel. all gasoline has toluene already in it. best bet for the added safety since you dont have a high octane fuel map would be to just add a gallon to a good tank of 93. if you go with too high of an octane on a map that isnt tuned for it you can/will have a lean condition. just my .02