kevden wrote:
On our last few long distance trips, I have noticed more power towing with our 2003 Yukon (6 liter) when using Shell VPower 93 octane.
I doubt I will convince anyone this is true, especially when shell 93 octane is the most expensive gas out there, just wanted to share what I have found.
Here in Canada regular Shell contains 10% ethanol, mid-grade 5%, but premium is 100% ethanol free and is the only fuel I ever used in my Honda gensets. I'd expect Shell formulations to be similar in the US and it just may be that your older Yukon simply runs better on non-ethanol gas, with higher octane rating having little to do with it.
