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As best as we know, in Canada diesel is diesel is diesel.

With the following caveats:

Husky claims a higher cetane. I have never used husky as the only one within a one hour drive of me does not have a nozzle small enough to fit in the CTD's filler neck.

Shell V-Power diesel claims a higher cetane and is fortified at the pump. It is available at only select Shell stations in Canada and Washington state. This is what I use. It seems to make the engine run smoother and quieter. When I changed my fuel filter there was no apparent water in the separator.

By regulation, diesel is seasonally altered in Canada to lower the cloud point and prevent fuel gelling. In the warmer months you are getting pure diesel. In the colder months it is cut with kerosene. The winter blend will always result in poorer fuel economy and engine power output.

Algae will grow in diesel, especially when exposed to light or left undisturbed. Fuel stations that do not turn over a lot of diesel are at increased risk of harbouring poor quality diesel. A fuel station that does not turn over its diesel storage tanks at least once a week should be avoided wherever possible.
 

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Anyway, back to the OP's query - I use ESSO diesel almost exclusively when I am in Ontario, simply because the station near me is in a price war with the station across the road. When ESSO isn't cheap I use Shell. I find that the car runs better on Shell fuel in terms of economy, but not by much. Using an off-brand fuel from a station that is really cheap results in poor economy with the DIC reporting a constant high average L/100km figure even though the actual figure is bouncing around with a lower value. I translate this to mean the car is doing frequent regens. Only guessing, I don't have the scanguage computer on this car.

I am currently on Prince Edward Island using Irving diesel. The car runs fine and I am getting average economy ratings in the 5.7 - 6.2 range.

Agreeing with Tomko - aside from Shell's V-Power and ESSO using the Top-Tier marketing label, there is no obvious way of telling where diesel comes from, at least from Ontario to the east coast. Supposedly, there are only two producers in Canada. Could there be an obvious difference between the two products? Then, what about the fuel from the off-brand cheap station that I sometimes use? Could it be expired fuel from other stations? Has anyone heard of stations evacuating 'stale' fuel?
One thing to keep in mind is that Top Tier applies only to gasoline. There is currently no equivalent industry program for diesel.
 
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