Curious observation that I cannot support searching the internet.....
I'm driving a 2016 3.6 V6, the owners manual and sticker inside of the gas door recommends regular gas. I generally use Shell in Canada, but I have used another Top Tier brand when a Shell station isn't handy.
Daily commutes to work I get 10.3 L per 100Kms, its been consistently averaging that since I got the vehicle in July.
Last week, I drove to Buffalo to pick up my daughter and filled up with some brand I never heard of, I was in a hurry and didn't feel like driving around to find another station. On the trip home (4 hour drive), I noticed that my mileage was less on the return trip. I chalked that up to using a non Top Tier fuel.
A few days later I returned her to Buffalo and filled up at a Sunoco Station in Buffalo, I was below 1/4 tank. Sunoco I believe is a Top Tier. There was no improvement in Mileage.
This week, my daily commutes have been as low as 10.8 and as high as 11.3L per 100Kms. Roughly using 0.5L per 100Kms more than normal. The temperatures have remained mild and I am not aware of any other influences that could affect the mileage.
My only assumption, is besides ethanol which is up to 10% in regular gas in Canada, what else is in US gas that could affect mileage?
I'm going to run this tank down before putting in fresh fuel. I'm really curious if my mileage will improve.
Is anyone aware of a difference? I did find this one article, but it really doesn't tell much
Is Canadian gas better than American gas? - The Globe and Mail