7
Costco vs shell gas
- Thread starter dtran11
- Start date
jay745
What Would Glenn Danzig Do
- Location
- Slightly Outside Chicago
- Car(s)
- Mk6 racecar, Tacoma
Doesn't surprise me, years ago I went down a rabbit hole researching fuels. Long story short, I only use shell now.
carchrism5
Go Kart Champion
- Location
- CT
- Car(s)
- GTI
This is worth reviewing https://toptiergas.com/licensed-brands/ Like the "what oil should I use" threads you'll get a thousand different answers and opinions. I just try to keep it simple and go top tier 93 only and call it a day. I've had great experience with Costco myself on numerous cars, most of which were running 93 oct tunes. Just did a 1500 mile trip using a few different brands of top tier and MPG was identical from one to another, so seeing a roughly 15% difference as stated makes me think there's something else going on or you may have just gotten a bad tank which is possible. Hope the link helps.
One difference is that the Costco is in Wisconsin (first time at this station) and the shell is in Illinois (the same one I always pump at)
NopeR
Autocross Champion
- Car(s)
- 18 Golf R
I use Petro and got an extra 50whp and 100mpg compared to using any other brand.
Seriously though, gas where ever you want, it doesn't really matter as long as you use high quality (91oct+) fuel from a reputable supplier. I actively avoid private retailers, but the odds are the gas is essentially all from the same source.
"top tier" doesn't mean much except that the retailer paid for that licensing.
Seriously though, gas where ever you want, it doesn't really matter as long as you use high quality (91oct+) fuel from a reputable supplier. I actively avoid private retailers, but the odds are the gas is essentially all from the same source.
"top tier" doesn't mean much except that the retailer paid for that licensing.
Sounds like ethanol content changes between states.
Yea that might be it. Or they allow more water lol
Escape Hatch
Autocross Champion
- Location
- USA
- Car(s)
- Mk7 GTI
Not sure but tuned on (Recommend by my tuner) Shell 93. She runs 5.5* up top at right around 28 pounds with zero KR. Wonder what timing others see on Costco 93.
PowerDemon
Autocross Champion
- Location
- Richmond, VA
- Car(s)
- Golf GTI, Camaro ZL1
I run Costco 28psi on 5* with sometimes a touch of KR in 4th but nothing concerning.
When I upgrade the PUT sensor to turn it up my tuner wants me to switch brands, and I will be going back to Shell. It’ll be interesting to see the comparison.
I will say Shell 93 costs 44 cents more than the Costco 93
JC_451
Autocross Champion
- Location
- NJ, one of the nice parts.
- Car(s)
- 2017 GTI Sport
There are -way- too many variables to make any kind of determination from a single visit.
Granted, falling from 32 to 27 mpg is significant, but that is highly variable as well. I know for a fact that if I choose to, I can go out and get 220 miles from a tank and get about 20mpg, just from heating it up on the roads(driving fast).
Granted, falling from 32 to 27 mpg is significant, but that is highly variable as well. I know for a fact that if I choose to, I can go out and get 220 miles from a tank and get about 20mpg, just from heating it up on the roads(driving fast).
I hear you but I am driving even faster deliberately with the shell gas to make sure I give the benefit of the doubt to Costco.
JC_451
Autocross Champion
- Location
- NJ, one of the nice parts.
- Car(s)
- 2017 GTI Sport
Unless you do everything exaxtly the same any "testing" is just further muddying the waters.
GOLF NUTT
Drag Race Newbie
- Location
- Planet Earth for now
- Car(s)
- 2019 Golf GTI
Shell 93 octane is the only fuel that my GTI has known since
I purchased it with less than 1/2 tank from the dealer.
I purchased it with less than 1/2 tank from the dealer.
vj123
Autocross Newbie
- Location
- The Detroit
- Car(s)
- 19 & 16 GTI - sold
How many times did you fill your tank from costco for this comparison.