US and Canada use AKI, not RON. The fuels are identical, the US and Canada just use a system which results in a lower number displayed at the pump. 99 RON = 93-94 AKI, which is available but is sometimes harder to find. 95 RON = 89-91 AKI, which is available at every pump. 87 AKI is "regular unleaded" and equates to 91-92 RON. 85 AKI is only found at really high altitudes. I've never seen 85 AKI outside of the Rockies.