Here When you take 94oct fuel its the same pistol of the 87oct fuel but i would say 95% would take 87oct in there car
My question is how much liter of 87oct fuel goes in the car before 94 oct fuel come in ?
That is why i always fuel my car empty to full to have min87oct fuel...

 

Here; it’s negligible

https://www.quora.com/When-switching...and-the-nozzle

 

this always bothers me at pumps with a single hose.

in az we only get 91 as our highest choice so to have half a gallon of 87 dilutes it all a tad more.

 

Not enough 87 to be concerned with.

 

Thx guy's

 

I think about this a lot!

I don't like to let my cars get down below 1/4 to 1/2 just in case. If the first, let's say 1/2 gallon, is 87. After a few refills, the proportion of 87 only increases in the tank with each top off? I have 93 in my area, and an untuned NA motor so it won't affect me as much, but still a pain to think about.

 

I found A solution i bring with me a 2gallon fuel tank when i go fuel my car so im sure i dont get half a gallon of 87oct in my tank just to feel safer

 

do the math.

in a 16 gallon tank with 5 gallons of 93AKI in it, if you pump 11 gallons of 93AKI but the first entire gallon is 87AKI, your gas tank is still 92.6AKI as a whole.

in the real world, the amount here is so, so negligible that it straight up does not matter.

if you're running a tune that requires exactly the maximum available octane at your pump, then you need to stop driving on the streets with pump gas, or back off your tune.

holy cow that's excessive.

 

Well that maybee excessive but dont want to take any chance in my situation you know my setup...

 

What happens to those extra 2 gallons every single time you pump? lol
I'm guessing it would just get dumped into another one of your cars.

 

With all due respect, you got to be kidding!

 

i drink it🥶 well yeah i have my suv

 

Yeah theres no 87 going into my car for ever🤨that is extremist but when your at 33-35psi of boost i dont wanna f... with one drop of 87
If your car is stock no worry with 87
when you get E85 theres no mix as well diesel lol

 

^^^ Yep, can never be too careful!

 

Just don't think you are getting less ethanol with high-test fuel. That used to be the case.

A simple experiment with 800 ml of fuel and 200 ml of water in a 1000 ml graduated cylinder. In each case, fuel was first put into a gas can to eliminate what might have been in the hose.

And these are the results...