I worked at a BP in college and before (6 years) and know that we were getting the same gas delivery as the stations around us, including an off brand gas station down the road. Also, the gas station having a newer underground tank is huge. Gas stations are allowed to have a certain amount of water in there tanks (it happens) and the older the tank, more water. The owner is supposed to clean the tanks often but that is expensive and I know some owners will not. How full the actual underground tank is with gasoline is a big thing as well. If you are the unlucky person who gets the gas when the gas stations tank is low and needs to be filled, you may get some water as well. There are too many factors. Each pump also has a fuel filter that needs to be changed often and can damage cars if they are not changed. You can tell the fuel filter is old in the pump if that pump is going very slow. If all of the pumps are pumping slow then the station is low on gas. I would suggest looking at stations that are just well kept.
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2014 370z - Invidia Gemini CBE - AAM Test Pipes - Stillen Gen 3 Intake
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