Top Tier gas - has this been done before?

[ice445]

I filled up with Costco 91 instead of my usual Chevron 91 and I can already see a bit of difference in the logs when it comes to timing advance/knock retard. Nothing crazy though.

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[K4fxd]

Nothing crazy though.

Better or worse?

 

[ice445]

Better or worse?

Worse, by 1 or 2 degrees on average. Its hard to exactly quantify because every drive is different, but that's what I'd wager.

 

[K4fxd]

The Chevron might actually be 93.

 

[ice445]

The Chevron might actually be 93.

I wish, then maybe the FP tune would work without pinging in the heat lol

 

[robvas]

Just came across this post...

https://www.mustang6g.com/forums/th...gt350-gen-2-voodoo-engine.190461/post-3866264

 

[K4fxd]

Just came across this post...

Except Costco and shell gas come from the same distribution tank.

 

[robvas]

Except Costco and shell gas come from the same distribution tank.

Additives are different, maintenance on the tanks is different, probably 50 other things.

I don't buy the 'all gas is the same' schpiel. I realize it all comes from the same handful of distributors/refineries but I don't think it's that cut and dry.

Like Kroger tomato sauce comes from the same place as Ragu or Prego or whatever, they just put a different label on it...

 

[K4fxd]

Round these parts Shell is almost 5 per gallon and costco is 3.80 to 4.20. Costco gets 3 or 4 tankers of gas a day. Shell gets one a week. I log less timing with Shell than Costco.

If you talk with a tanker driver he will tell you it's all the same gas.

I'll take the cheaper fresher gas. When I'm racing I buy VP in a can.

 

[Decosse]

It may be the same in the truck, but once it's in the tank it's not. They each have their own additives, detergents, filtering systems, maintenance schedules even amount of water and other grit and whatever in the tanks. And that comes from someone whose job and company services and tests all the systems involving fueling at gas stations.

 

[ice445]

Costco blends their additive in at the station and uses more than most places, at least that's what I came up with after digging around. But otherwise it sources the gas from the same local terminals as most other stations. I work next to a fuel distribution station and refinery (marathon) and I've seen the same trucks at Costco and there so it's probably coming from the same place.

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