03-10-2010, 04:35 PM
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#11 (permalink)
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A True Z Fanatic
Join Date: Jun 2009
Location: Jenks, OK
Posts: 2,281
Drives: 370z Touring/Sport
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Quote:
Originally Posted by 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.
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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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