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How about some experience instead? For decades, Porsche has recommended running a dose of Techron in their cars for this exact purpose. We have used in in the shop since the day we opened our doors. Our standard "pre-hibernation" service recommendation's include running a full tank of Techron dosed fuel through the engine just before bringing the car in for its last service of the season in preparation for putting the car away for the winter, which includes an oil and filter change, pre winter battery and coolant system checks, and a full inspection of the car's systems. Afterwards, air up the tires, a full tank of fuel dosed with StaBil, a full cleaning of the car, hook it up to a battery maintainer, and put the dust cover over it until spring. Never had one start the next season with fuel system related issues in more than thirty years. I cannot make that statement about cars that were not dosed with Techron before storage. We sometimes get a poor running car in the shop with no codes or other apparent issues. Sometimes we see them with codes indicating a possible of one or more leaking injectors; as a precursor to spending a lot of time and the customer's cash, we have them invest $15-20 in a bottle of Techron and run the car for a couple days. More often than not, the problem disappears. We have had the opportunity to bore scope cars before and after using Techron, you would be amazed at the difference in the combustion chambers and the tops of the pistons, which is why you should always change your oil after using it. Techron is not a "miracle in a bottle", but it does live up to its claims.