- Joined
- Dec 14, 2022
- Messages
- 2
I live in Vegas. There are no real fuel stations. 91 octane is “premium” here. Long story short….I just bought a 2018 CTS-V, 4,800 miles. 6.2L supercharged. It’s stock. Owners manual says “recommend using 93 octane”…..”if no 93, use 91 under loss off mpg and loss of performance…..may cause engine damage”.
I have 2 choices really…
1. Use 91 Octane. If that’s the case, I ask which is better because some cars act better on certain fuels. I had a Syclone that would ping on 93 octane in Illinois but not 93 Mobil. I’m thinking Shell 91 or Mobil 91?
2. Arco has 100 octane. Is it ethanol free or 10% ethanol? My tank is 19 gallons and I’m thinking use arco 100 for 4 gallons and Shell/Mobil 91 for the rest.
Arco pics attached as examples.
I have 2 choices really…
1. Use 91 Octane. If that’s the case, I ask which is better because some cars act better on certain fuels. I had a Syclone that would ping on 93 octane in Illinois but not 93 Mobil. I’m thinking Shell 91 or Mobil 91?
2. Arco has 100 octane. Is it ethanol free or 10% ethanol? My tank is 19 gallons and I’m thinking use arco 100 for 4 gallons and Shell/Mobil 91 for the rest.
Arco pics attached as examples.