Here all 3 or 4 octane levels depending on the vendor come out of the same pump via the same hose! OMG the last guy may have used (gag) regular gas and I want need 93 octane!

My S2000 usually gets 10 gallons of fuel when it looks low enough on the gauge. There's at most five (5) cups (1.2 liters) (0.31 gallons) of the last pump user's fuel (probably horrible, damaging 87 octane!) left in the hose causing a dramatic octane reduction from 93 to 92.8.

BTW I was road tuned on Shell 93 octane at 1,100' ASL in 82°F at 1006.7 barometric pressure, 42.7% humidity, at 1100 on a Saturday morning when the moon phase was nearly full, and my tire pressure was 32.6 psi. Car runs like crap unless I meet all those requirements. Hopefully science will discover and perfect a computer thingie to account for all this.

-- Chuck

 

lol ! Hey I have mixed 101 and 89 to get ~95 before Had to get some 89 because nothing else around, drove easy to the next town, and all I could find was 89 or 101 (near a lake) and had half a tank of 89, so topped er off with 101 and was on my way! We joked that after a couple of hard turns and stops it should be mixed up just fine.

What really gets on my nerves is that in Lincoln where nats is held, they have VP Racing gas stations all over and most of them only have 89 octane fuel ...