I think for people with jerries and big tank cars, going across the border, excluding any time cost, it can be worthwhile if you do some grocery along with it.
Here's a good simple calculator:
https://www.crossbordershopping.ca/u...ngs-calculator
buddy and I just went across yesterday to pick up pkgs. It was 2.89 in Bellingham for diesel at Costco, comparing to diesel price from gas stations nearby, the difference is ~33% or ~50ct CAD/L AFTER factoring the currency exchange and everything into.
At 80L per tank, plus 2 6gallon jerry, we were looking at 120L of fuel in total, the saving was $60 vs. fueling in Canada. Not to mention the 2 gallon of milk for U$4.xx (roughly $6cad), which I bought 3 (kids drink milk like water+me making coffee) and that's another ~$10 saving. And I assume ~$10 worth of gas to make the roundtrip.
It's worth mentioning that many things in Costco US are NOT cheaper than Canada. Things like coke, diapers... etc are priced pretty much at par, meaning we in Canada get 30% discount on them. But meat and some pkg food are cheap as fuck. I got the Kirkland vitamin gummy that my kids take. It's 7.99 after instant discount for both US and Canada... but the US it's a package of 2bottles vs. single in Canada!
The way I think about is, every time I cross the border for gas, I basically get groceries for free...
