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I don't use injector cleaner on any specific intervals, but I do put some in I guess about every 5,000-10,000 miles in my daily driver just for preventive maintenance and have never had any injector problems other than having to replace an O ring in one once. The injector cleaner I usually use is CD-2 concentrated cleaner and you only add 1 oz per tank for tanks I think up to 15 gallons. Sometimes I will notice a little increase in mileage and sometimes I don't. My '97 Escort is basically driven on longer trips 500+ miles so sometimes the gas sits in it for a few months, so I try to always add injector cleaner to it prior to driving it on a trip.
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