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First of all, find out if the station is company owned or a dealer franchise. Company owned stations are almost never shorting octane by mixing 87 or lower octane into the premium higher octane fuels. If a BP or Shell were caught doing this they would get sued big time.
If it a dealer franchised or independent owned station the owner would have to have some arrangement with the fuel delivering truck company to put lower octane in a premium tank.............so check with the trucking company about their history of any violations.
Finally, check with the texas energy commission or regualtory authority about records for the station.
I'm not saying it doesnt happen, because their is a built in 20 cents gallon profit for somebody who is doing it!!! It is common here in WA state because of the high percentage of fly by night station owners and truck drivers taking money under the table for doing it.
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