You can surely buy fuel wherever you choose, but know any large volume retailers are moving much more fuel than others so it is always fresh & has not been in their storage for months, did AAA report any claims from any major supplier for bad fuel.
There are specific criteria every refiner must meet before the fuel leaves the refinery & is sampled hourly to ensure that it meets that criteria, to be honest I don't know who coined the term "Top Tier" or exactly what it is, but just know if you are buying from a known retailer you aren't buying anything that should harm your engine.
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Fulltimed 10+ years
Sold '13 Thor Redwood 36 FB
Traded '13 GMC Denali DRW D/A
Replacement undetermined
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