Several mechanics over the years have told me that it's a false economy to not use premium when a motor has been tuned for it...reduces fuel mileage so you don't save as much as you might hope. I used 87 in my C3 Vette as that's all it needed...91 in my C5 and now 93 in my C7.
Not sure I would trust what a mechanic has to say about the topic to be honest. I always used Chevron 94 in all my corvettes and my Shelby GT500 because; well, just because, Now in my C7 I use Shell 91 V - no ethanol: the computer adjusts the engines function (settings) as I understand it. 91 Octane is the highest available at my local shell. I beleive there was a very technical post on octane and how it is measured etc. a while ago on CCF. I may have been the one that posted it?
I wouldn't have an issue using 91 and was thinking about it...but as it's readily available here for 3-4 cents/L more I figured I'd go with the 93.
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You don't need 94 Murray. Petro Canada and Sunoco are now one and the same. Sunoco just elected to keep the PC name in Ontario. There are very few 94 octane fuels out there that do not contain ethanol anymore. Ethanol actually boosts the octane rating. Higher octane fuel burns slower than lower octane, thus the reduction in pre-ingnition knock but our cars sensor systems nowadays adjust accordingly, thus why you never had a problem burning lower octanes. Ethanol burns slower as well. The only reason I don't cheap out for a lower octane fuel is the ethanol. I just don't like the corrosive qualities. Gas (in Alberta at least for now) now is mandated to contain a minimum of 5% renewable content (ethanol is the cheapest so thats why they use it). Some stations, that still offer an ethanol free 91 octane fuel meet the minimum renewable content (ethanol) by blending 10% in their 87 octane and 5% in their 89 octane. This allows them to have 0% in their 91 octane and achieve the higher octane by refinement with non-renewable additives. Soon, I venture, we will not have a choice. Feds are pushing for higher and higher renewable content all the time. 2020 is scheduled for a higher content again and 2025 is rumoured to have even more again. Soon we will be burning pure corn gas in our vehicles and corn on the cob will be gone from our grocery store shelves.... lol...
More than petro Canada sells premium gas with no ethanol. Costco is a top gas.
