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Leaded gasoline is still available in Canada, but only in Chevron-brand gas. It is rated at 94 Octane which doesn't compare with the UK octane rating system.
British petrol (gas) sold today (next week may be different) comes in only 2 basic types. The UK standard is called E10 and is unleaded fuel of approx 95 RON and which contains a maximum of 10% added ethanol.
The other and more expensive variety is now known as E5, formerly "Super Unleaded", an unleaded fuel of 97-99 RON rating (depending on brand) and containing no more than 5% ethanol
The RON rating currently used in the UK roughly corresponds to the old octane rating or around 3 star in the old british star rating, where 2 star was 91-2 octane, 3 star was around 95 octane, 4 star was 98 octane and the late lamented 5 star was 101 octane.
5 star was scheduled to be phased out over 5 years, starting in 1971. In fact, it disappeared from UK forecourts in a matter of weeks! 3 star was phased out somewhere in the late 70s as there was little demand for the "halfway house" grade, leaving only 2 star and 4 star available.
Things stayed that way, through the introduction of unleaded fuel in circa 1986, which became universal in 1988 and on until relatively recently when the first ethanol added fuel was introduced. At first the base fuel was 95 RON E5 and the "Super unleaded" was 97-99 RON and largely without ethanol (though pumps invariably described it as E5 as some counties added ethanol) A couple of years ago the system was updated (?????) again to the current ratings above.
If you have an OHV engined Dolomite In Canada, I would recommend you seek out and use the Chevron 94 octane leaded fuel as this will be kinder to your cast iron head. However the OHC "slant" engine with it's alloy head and steel valve seats is perfectly happy on unleaded fuel. If you have a slant, octane rating is more important than lead content, search out the highest octane unleaded fuel you can easily find, it'll be fine.
One last word of warning. If you are likely to have to use ethanol added fuels, even occasionally, it's best to get all your rubber fuel hoses replaced with ethanol proof material like Gates' "Barricade". Ethanol, even as little as 5%, literally dissolves ordinary rubber fuel pipes and can easily cause fires. I've seen it too often, even here in the UK where awareness of the problem is high!
Steve