Petro-Canada in Edmonton (5011 137th Ave)

Easy to get into with a trailer

Costco is busy, but the lower price of gas they typically offer is usually worth the wait. If you gas up in the middle of a week Day, you're less likely to be waiting.

it is on the same parking as the grocery stor

Not a very talkative staff behind counter.

Pumps are constantly out of receipt paper... The credit card terminals are flakey as I almost got locked out of my card for "incorrect pins" (the buttons just didnt seem to work at all...)

average gas station. small typical selection of snacks. Decent coffee, usually fresh.