The truth about Regular, Plus and Super gasoline.

Daishi

Ive heard from many different people even the owner of a gas station that often times all different octane gases are mixed in the tanks anyway so it doesnt matter. for example a truck comes in with 87 octane fills the 87 octane tank and has gas left over.. they will actualy put the remaining 87 octane in the 93 octane tank as to not waste gas. How true is this statement.

theDreamer

That I do not think is true.
What is true though is that many trucks deliver to a number of gas stations, and then they put in the additives of that stations (be it Shell/Exxon/etc.). Very few stations today control from port to station, and even more so it is around 75-80% of stations are independently owned (no control from the brand on the billboard).

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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.

Daishi

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.

vReath

i remember watching the local news a few months back on something similar to this. the news channel investigated on what grade is actually going into the underground tanks. they didn't mix the leftover 87 with 93 but just filled the 93 tank with 87. i don't remember how many gallons but there were a quite a few spots in Houston doing this.