Really? IIRC ULSD is the law in Canada as it is here so it's hard to imagine how costs would be much different.Check Gas Buddy and you see that many of the Canadian stations that sell diesel sell it for about 10% less than Regular....at least in summer.The best I see now around here now is 5 cents a gallon more than Regular.
It’s also a supply and demand thing. I’d imagine the demand in Canada is much less than in the US......................
It has been as much as an entire dollar (!) more than regular here at times. I remember that, and I’m sure others do also.
The EPA and California have emission standards that make all the other European competitive diesels unavailable to the American market. Like Subaru