Quote:
Originally Posted by kannibul
False.
The only "mixing" that occurs is when you get midgrade. Fuel Trucks deliver 2 grades of fuel, regular and premium. The actual octane depends on the place where they get the fuel from and how well mixed the fuel is (or if it's settled out a bit)
The tag on the pump will tell you if it's rated higher or lower when it was last tested - that said, gas stations know in advance when they are going to be tested, so they can spend a bit "more" on ensuring they get a tank load of 93 stuff in there to dillute the 91 (or worse) gas, and dump some 91 in the 87 tank to bump it up a notch, so they don't fail the test.
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ok i did speak with someone who used to work at several gas stations and he said that the gas stations are constantly being tested so if the octane is off they can get a huge fine.. now what he said is also true no matter what theres always be some water at the bottom of the fuel station tanks. which is interesting.