Here's a viewpoint from the driving.ca website by:
David Booth
Publishing date:
Oct 11, 2019 • June 10, 2022
For those of you looking for safeguards against the ravages of ethanol-blended gasoline, there are a number of precautions you can take. The first is that you can simply avoid it in the first place. According to Dan McTeague, a noted petroleum analyst, Shell and Esso 91 are both ethanol free.
[UPDATE: Chevron notes on its website that in some locations in Canada, its Supreme Plus 94 Octane fuel is also ethanol-free, as of 2022. —Ed.] All other grades from the companies have some ethanol content, but the mid-grade blend is pure gas, which means it not only corrodes less than ethanol blends, but is less likely to deteriorate when stored.
Does higher octane gas have less ethanol?
Don’t be misled into thinking higher octane gas contains less ethanol. In fact, it has more! The octane rating of pure ethanol is 100, but when it’s blended with gasoline, it performs as if it’s 112. In other words, higher-octane blends — Petro Canada’s 94 and Esso’s 93 — use more ethanol, not less.
Winter storage
For those storing their vehicles for the winter, specialty gasoline makers — yes, there are boutique gasoline manufacturers! — offer ethanol-free formulations specifically tailored for a long shelf life (as much as two years). For those on a budget, a trip down to Canadian Tire for some fuel stabilizer is usually good enough to preserve your pump gas — use that Shell and Esso 91 stuff — over the winter.