octane rating and engine performance
In Texas, the minimum octane rating is 87. On a recent trip to Glacier, I noticed a lot of the fuel in states like CO, WY and MT, the octane was 85, and you had to buy the mid-grade to get 87 and abov...
Forum Discussion
Lessmore wrote:
Even back in the '90's when we were towing with a '76 Chevy 350 cube V8 and a '97 Vortec 4300 V6...when we towed I would put premium fuel (91 octane). Other than that I would use Regular (87 octane) for everyday driving. Either way I never noticed any engine knocking or pinging. The newer Vortec automatically adjusted it's timing and /or knock sensor and compensated for lower octane gas. I'm pretty sure the '97 manual (Vortec V6) recommended high test gas when towing and that's what I filled up with, towing.
Exactly! I don't think it is just an Ecoboost thing and is mainly for dual fuel engines that can alter their ignition and valve timing for different fuels depends on how much knock is detected. Where people think this is only an Ecoboost thing I have no idea. My wife's non turbocharged Infiniti SUV says something similar in her owners manual.
