>>>So, you guys pay 50 - 60% more for fuel. And, I believe Vancouver has amongst the highest prices in North America, so your cost premium compared to average North American is even higher.
>>
>>As our prices include more misguided tax attempts, the gain from higher octane reduces the nearly linear (exempt for VAT)
>>tax burden for us more than for you. No wonder we go for higher octane earlier,
>>as the added cost for higher octane dwindles when viewed s percentage of total cost ;-)
>
>The odd time I've bought premium fuel here, I've noticed better mileage - but not quite enough to offset the extra cost. Sounds like it is cost-effective for you.

Yupp, my rule of thumb is ~4% more cost. Or if the tank is totally empty right before a long range drive,
half premium plus plus half premium with higher ethanol:
cost hike of plus is offset by subsidized ethanol, percentage of ethanol is ~7% instead of 10%
and the stuff is not long enough in the tubes as on reaching the target I fill up to dilute ethanol even further.