It’s true. Specially where the underground fuel tanks are old. Some of the old tanks had liners that 20 years on are starting to cause impurity’s in the fuel. I worked at a fuel distributor for about 7 years and you would be amazed at what ends up in the fuel sometimes.What? Maybe if you use Shady Joes Gas Company there will be stuff in the gas? Think thats why the have filters on the pumps.