When adding injector cleaner to your fuel, is it better to drive until (almost) empty or to fill up with fuel again at, say, half tank? Also, is it better to do

Answer (1 of 8): Drive until you get to 1/4 or 1/2 tank. Add injector cleaner. Fill up tank. Drive as normal the cleaner and the injectors won’t care. If you don’t think they are clean enough do it again. It won’t hurt anything if you do.

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