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Old 12-02-2012, 07:07 PM
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Costco gas quality, What do you think?

I filled up at costco yesterday. Price was too good to pass, 3.49 for 92gas with extra 3% discount. I was a little worried about the gas quality so I did a little data logging. 10 mins of driving including multiple WOTs up to 6300RPM. Pulled the log to my computer and wow. I see 3.5 degree of ST KNK! I have been keeping track of different gas brands. So far my results are:

Chevron: 0 ST retard. 14 fill ups

Shell: 2~2.5 ST retard. 5 fill ups

76: 0 ST retard. 3 fill ups (This 76 station is right next the costco I filled up yesterday)

Costco: 3.5 ST. 1 fill up.

All the gas are 92 grade. At least from my data sets, Costco gas surely is worse than other named brands.
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Old 12-02-2012, 07:22 PM
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Cant be worse then walmart gas.
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Old 12-02-2012, 07:29 PM
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Cant be worse then walmart gas.
Here at walmart they have space-age gas stations. So far I am not brave enough to try it
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Old 12-02-2012, 07:37 PM
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I use Shell, my car's tune is very dependent on clean 93 that I use the same station everytime.

I'm looking at making a switch to E85, want to talk about a nervous feeling on finding fuel.
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Old 12-02-2012, 08:11 PM
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Filled up Friday at Shell with their Premium, I received 55 cents off through FuelRewards so 3.25 a gallon... ever since my 07 rt has been rumbling and shaking.... not like its gonna die out or anything just very jittery at all times.
Wish I had money for a tuner to log my stuff lol. It used to feel like Shell would make it cruise with noooo prob and this recent fill up changed that idea. Marathon also made it smooth out but expensive so ill stick to Thorntons and hope its not bad gas lol.
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Old 12-02-2012, 09:04 PM
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I don't have enough nerve to try space age or arco. Always stick with chevron or 76.
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Old 12-02-2012, 10:02 PM
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I don't have enough nerve to try space age or arco. Always stick with chevron or 76.
I'n going back to Chevron for next tank of gas. 5 dollar cheaper doesn't really worth the 3.5 degree of ST Retard.
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Old 12-03-2012, 07:44 PM
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Costco gas is a s#!t mix. I called to see what brand they purchased and was told by the manager that they purchase whatever they can at the lowest price. So seems they sell week old leftovers.
I'd never let my SRT drink that crap.
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Old 12-03-2012, 08:00 PM
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I try to shop at stations listed at http://www.toptiergas.com/index.html . But mainly I use shell
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Old 12-03-2012, 08:09 PM
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how are you tracking these st retards etc?? via diablo?

Isnt the age ofthe fuel equally if not more important to those figures? not only how long the gas sat at station but also how long in your tank...
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