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They shouldn't. Soda at a fast food place has the highest profit margin of anything on the menu. That's why places like McDonald's are offering specials like "any size for a dollar". It's incredibly cheap. I'd say it's more likely that fast food soda dispensers aren't maintained as they should be.
They have to be "brixed", controlling the ratio of carbonated water to syrup. The nozzles and assemblies have to be cleaned out, soaking is best. The entire supply line post mixing has to be kept cold as well. Temperature has a huge effect on flavor.
This has to be done on a regular basis. Unfortunately for the consumers, fast food jobs have been dumbed down as much as they possibly can be to compensate for a shrunken workforce and ridiculous turnover. I would be surprised to find more than one person in any given location who knows how to properly care for a drink machine and is willing to do it. I would not be surprised to find locations without anyone who could/would do it.
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Good friends we have had, oh, good friends we've lost...along the way. In this great future, you can't forget your past. So dry your tears, I say.
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