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It's interesting....I too have been a long costco gas customer...and recently due to low fuel, I went ahead and gas up at mobil gas station. Well, I can tell you I could feel the difference right away...with costco gas...the gear is shifting much faster at lower rpm...but with mobil, the upshift doesn't happen at a later rpm....if that make sense?
I fill up at my own gas station. We use to be a Phillips 66 but are in the process of switching brands and rebranding our store. I find shell gas to give me poor gas mileage per tank compared to other brands here. I have yet to pump Valero branded gas along with Citgo in any of my cars. Gasoline is essentially the same, what makes it different from brand to brand is, the additives they put into their gasoline before it shipped out to the retailers. So what you find at Costco, Walmart, local grocery chain stations all have the same gas and it's usually without any additives thus making it cheaper to buy.
I fill up at my own gas station. We use to be a Phillips 66 but are in the process of switching brands and rebranding our store. I find shell gas to give me poor gas mileage per tank compared to other brands here. I have yet to pump Valero branded gas along with Citgo in any of my cars. Gasoline is essentially the same, what makes it different from brand to brand is, the additives they put into their gasoline before it shipped out to the retailers. So what you find at Costco, Walmart, local grocery chain stations all have the same gas and it's usually without any additives thus making it cheaper to buy.
And there's where you're wrong...Costco gas does have additives therefore I find performance using gas from there similar to getting gas at other top-tier stations. That might have been the case in the past before Costco became a top-tier station, but not anymore.
Not sure if Walmart or other grocery chain stations are certified as top-tier stations...
I've been using shell as i get a good discount from supermarket buying, usually .30 a gallon. My Subaru with 87 octane averages 26+, 30+ on highway. Just bought a GS, have to think about what to use. I assime 89 octane is not high enough.
And there's where you're wrong...Costco gas does have additives therefore I find performance using gas from there similar to getting gas at other top-tier stations. That might have been the case in the past before Costco became a top-tier station, but not anymore.
Not sure if Walmart or other grocery chain stations are certified as top-tier stations...
My mistake I forgot they are now top tier. I don't fill up there so I didn't know.
They're both fine. These engines don't make enough power for you to have to worry about whether one is good and the other is better. I use both fuels in cars making double to triple the power the GS makes, no issues. Even people saying they feel a difference in power, unless they put in 87 octane, are most likely overthinking it in their head more than actually feeling a change.
GT-R, Viper owners, Ferrari owners, Z06 owners all use pump gas making twice what a GS does. They'd have far more to worry about than you. So don't worry about it, just pump it and realize it's a just a basic V6 that you're driving.
They're both fine. These engines don't make enough power for you to have to worry about whether one is good and the other is better. I use both fuels in cars making double to triple the power the GS makes, no issues. Even people saying they feel a difference in power, unless they put in 87 octane, are most likely overthinking it in their head more than actually feeling a change.
GT-R, Viper owners, Ferrari owners, Z06 owners all use pump gas making twice what a GS does. They'd have far more to worry about than you. So don't worry about it, just pump it and realize it's a just a basic V6 that you're driving.
I doubt there would be a performance difference too, but the additives are just there for cleaning purposes aren't they? I read somewhere that the additives that they put in Chevron gas is basically the same stuff that you can buy at your typical auto parts store like Autozone except in very small amounts in each tank that you fill up.
