Look for Partner Deals and Rewards Cards
These days, there are a lot of partner deals that can save you a few cents a gallon — and these can quickly add up. For example, AAA members (or CAA in Canada) save $0.05/gallon (or $0.03/litre) with every fill-up at Shell stations.
If you happen to live near a Costco with a gas bar, your membership also includes savings of up to $0.30/gallon — that’s enough to cover the cost of your Costco membership for the year if you fill up often enough.
Several credit cards also offer rewards or cashback, specifically on gasoline purchases. While these won’t save you money directly at the pump, at least you’ll get something out of it.