Out here, we're already too close to knock threshold with 91 octane. Yes, gas is the same before each company puts in additives. The theory is that Chevron puts too many detergents (techron) in their gas, that the octane is lowered compared to shell or 76. I can feel a big difference above 6krpm on a 3rd and 4th gear pull.

 

They're using correction factors for the pulls. But the conditions are even slightly better for the Chevron run.

 

I would LOVE to see the "evidence," scientifically mind you, that proves adding techron to your gas is "bad" for the octane. I run 93 Chevron all day long and I'll show you why.

http://www.chevron.com/products/prod...dvantage.shtml

"
About half of the cars and trucks on the road today have engines that are equipped with a device called a knock sensor. A knock sensor is designed to detect knock, often before the driver does. Upon sensing knocking or pinging, the engine’s computer control system (engine control module or ECM) adjusts the engine’s operation (retards the spark timing) to avoid the knock. These adjustments can reduce power and acceleration under certain driving conditions, especially under heavy acceleration when you want power the most.

Since excessive combustion chamber deposits can promote knock, they can also suppress your engine’s full potential by contributing to more frequent knock-sensor operation. Chevron Unleaded gasolines with Techron are unbeatable at preventing harmful combustion chamber deposits, helping your engine maintain the maximum performance for which is was designed.

In certain sensitive engines, excessive combustion chamber deposits generated by lower quality gasolines can result in the top of the piston banging into the bottom of the cylinder head. This banging, called combustion chamber deposit interference, can produce a loud, unpleasant noise noticeable at cold start. Chevron gasolines with Techron are unbeatable at avoiding excessive combustion chamber deposits that can lead to cold start noise.

If your car is experiencing this problem, it may be best to treat the gasoline in the fuel tank with a bottle of Chevron Techron Concentrate Fuel System"

 

INFACT, Shell and 76 have to put the Emissions required detergent in their gasoline by law. It has been proven scientifically that Techron provides a better anti-knock gasoline versus the other companies addatives.

 

Thats fine.. You have 93 octane. We don't. I respect Vishnu and Neuspeed's opinion on car tuning and have heard it from both to stay away from Chevron.

 

Yes, but Vishnu and Neuspeed don't have multi-billion dollar testing facilities with valve testing containers, nor are they respected by the big three automakers, which buy this gas just to pass emissions tests. As seen here: http://www.chevron.com/products/prod...cessbig3.shtml

Furthermore, I respect your opinion and hope you have a great time with your car. It's just a shame that you'd trust a single dyno run versus years of multi-billion dollar testing and proof by engineers.