Fuel Injector Cleaner?

[Biz-z Z]

Is there any particular “name brand” of toluene that I should be looking for or do I simply ask my hardware store clerk for “a gallon of your best toluene please?”

Also, I am looking for clarification of the recommended amount. The way it is recommended in a previous post seems vague to me. Sometimes I fill up from a half tank, other times I might be running on fumes before I gas up. Do I add 6 oz. every time no matter how much gasoline I need with which to fill up? The 987 Box’s fuel capacity is 16.9 gals. according to the manual. When it is recommended that we

“add about 6 oz. when you fill up and you'll never have clogged injectors,”

is that the same as saying 1 oz of toluene for every 2.8166 gals. of gasoline or rounding it up 1 oz of toluene for every 3 gals of gasoline? Would that be the proper ratio to get the job done and not hurt the system in any way?

I am not trying to nit pick here, I just don’t want to screw up a good (and expensive) car by not understanding and following the recommendation exactly. Thanks.