REVscene Automotive Forum - View Single Post - Dyno testing fuels - Big difference between Shell 91 and Chevron 94

Traum · 07-02-2021, 01:25 PM

According to Adam (the VanCity Audi dude), Racing Greed explained the variance with Shell V-Power being most likely a case of the ECU trying to advance timing to deliver more power, only to realize that something wasn't quite good enough, and had to dial back on the ignition.

Based on the results, I wouldn't say Costco is necessarily better than Shell V-Power, or that Chevron 91 is always as good as their 94 gas. What we can see is -- Costco gas seems to be far more consistent, whereas Shell V-Power might have a bit more headroom for extra power, but the ECU might do funky things in attempt to dip into that extra headroom.

The consistency issue with Chevron 94 is something I have anecdotally observed myself as well, as some days my cars will feel noticeably stronger with one batch of Chevron 94, while on other days, it seems more tame.

Suffice to say, my personal takeaway from this series of winter + summer blend review is -- if I am regular street driving, I am just gonna go get whichever brand of gas that is cheapest and most convenient. If I am heading for the track, I'll try my best to run a tank of Chevron 94 before I actually hit the track so that the ECU can adapt to the fuel, after which I will run Chevron 94 at Mission. If I'm at Area 27, I'll fill up with the Oliver Petro Canada Ultra 94. If I am in the States, I'm gonna get Shell V-Power 92 or Chevron 92.

The Blaine gas was brought up by a friend who is an essential worker that still crosses the border.

07-02-2021, 01:25 PM	#116
Traum RS.net, helping ugly ppl have sex since 2001 Join Date: Aug 2007 Location: Paradise, BC Posts: 8,400 Thanked 8,167 Times in 3,399 Posts Failed 263 Times in 149 Posts	According to Adam (the VanCity Audi dude), Racing Greed explained the variance with Shell V-Power being most likely a case of the ECU trying to advance timing to deliver more power, only to realize that something wasn't quite good enough, and had to dial back on the ignition. Based on the results, I wouldn't say Costco is necessarily better than Shell V-Power, or that Chevron 91 is always as good as their 94 gas. What we can see is -- Costco gas seems to be far more consistent, whereas Shell V-Power might have a bit more headroom for extra power, but the ECU might do funky things in attempt to dip into that extra headroom. The consistency issue with Chevron 94 is something I have anecdotally observed myself as well, as some days my cars will feel noticeably stronger with one batch of Chevron 94, while on other days, it seems more tame. Suffice to say, my personal takeaway from this series of winter + summer blend review is -- if I am regular street driving, I am just gonna go get whichever brand of gas that is cheapest and most convenient. If I am heading for the track, I'll try my best to run a tank of Chevron 94 before I actually hit the track so that the ECU can adapt to the fuel, after which I will run Chevron 94 at Mission. If I'm at Area 27, I'll fill up with the Oliver Petro Canada Ultra 94. If I am in the States, I'm gonna get Shell V-Power 92 or Chevron 92. The Blaine gas was brought up by a friend who is an essential worker that still crosses the border.