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@Trube78,
Very Good Post! I agree with you about 99.999%. Premium Gasoline is more highly refined and extracts many more long-chained Hydrocarbons than the lower grades and it does contain more energy/unit volume, but not all that much.
But, on point, the need for using Fuel Injector Cleaner varies widely and is often done too often. If the injectors are not dirty or varnished, there is little benefit, if any to using it. Also, as you rightly point out, where you buy your Gas can make a difference as well as how you drive your Car and how often. A Car driven daily will go many more miles before injector cleaning is required as opposed to a Sunny Sunday Car. The amount of time Gasoline spends in the system stagnant has a great effect on the build-up of Varnishes and Waxes which leach from the Gas.
All things being equal, in general, adding Injector Cleaner once a year, or even every other year, is usually sufficient to keep the injectors operating as they should. If you actually require it more frequently than this, you need to reassess which Brand of Gasoline you're buying and where you buy it...
Happy Motoring!... Jim'99
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