I'm wondering if it might be beneficial to follow someone at the pump who was also pumping 93 octane? How much 87 comes out one of these shared pump systems we have today before the 93 starts to flow? I buy COSTCO gas here in W. GA and currently the price difference is 59 cents a gallon higher than 87. More interested in keeping the 87 out of my tanks.
Pumping 93 Question
- Thread starter MotoMike
- Start date
In the grand scheme of things, unless you're filling a 1gal gas can, you are talking about such an insignificant amount of gas it really shouldn't matter. Are you really hurting for that 59 cent savings?
This looks like the classic BITOG over worry about something that does not matter.
This looks like the classic BITOG over worry about something that does not matter.
I always pump a gallon or so of premium into my car before filling my can. I have 2 vehicles that call for 93 but 91 is the best I can get so I need all the help I can get
Costco uses long hoses, and I'm fuel filters used for gas pumps are pretty big and I'm guessing can hold close to a litre, so I'm guessing maybe a couple of litres.
None of the vehicles in your signature should care much if the 93 is diluted down to 91, but if it's a matter of keeping ethanol out of the old bikes, you could always fill some jerry cans with 93 after filling your truck.
None of the vehicles in your signature should care much if the 93 is diluted down to 91, but if it's a matter of keeping ethanol out of the old bikes, you could always fill some jerry cans with 93 after filling your truck.
I use 87, so I'm thankful for the longest hoses possible!
Im not waiting in that line, Fastrip is usually cheaper than costco anyway.
Patman
Staff member
Most station’s hoses will hold almost one liter of the previous gas used so it doesn’t change the total octane too much on a full tank but it’s something that still bothers me. I remember when I first started driving that a few stations had dedicated hoses that only dispensed premium. Sunoco was especially good at that.
I would agree with the 1 to 2 liters likely. So if you put 2 liters of 87 and 40 liters of 93, my math puts you at 92.7.
I wouldn't sweat it.
Now if your filling a 2 gallon can - very different.
I wouldn't sweat it.
Now if your filling a 2 gallon can - very different.
I think murphys USA says something to the effect of less than a gallon of residual gasoline from the previous user could be pumped when you start pumping.
Its been a while since I've been on here so updated my signature with current vehicles. I use non ethanol 91 octane from a dedicated pump for the bikes. Its the Mustang and F150 I use 93 octane. Ford says both will run on 87 but recommends 93 for best performance. This topic brings up some controversy when discussing with friends. My take is why would you buy, spend extra, on a high performance motor then handicap it by not running the best fuel? I'm retired anyway and don't put the miles on any of my vehicles like I used to.
Yes, the volume of gas in the hose is probably negligible, I think my main concern was how much might still be in the system between the hose and the tanks? Is the switch between octanes quick enough to leave only the hose contents as the prior purchase octane?
Luis, the attendant at our Sharpsburg, GA club, told me the company is real good about checking the condition of their tanks for contamination. This club's tanks anyway have an automatic detection system for water and they have tanks checked monthly by a third party. This is a super high volume station and during peak shopping hrs. all 18 pumps are in use with a line waiting.
I wouldn't sweat it, but I do prefer stations with a single hose for each grade.
In the OPE forums where there more concerned about getting E10 vs E0 out of the same hose, they say 1/2 gallon or so.
For a vehicle fill probably not matter. Still, your paying a lot for that 1/2 gallon of 87
Hermann
Site Donor 2023
That would be nice
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