I was in Vancouver in July and used three different cards to compare the exchange rates. All transactions are very small, except the two noted. I don't know whether the exchange rate is figured by transaction or posting date so I included both

Rate Transaction-Posting

American Express Delta SkyMiles

1.5094 19-22

Schwab Visa (attached to my Schwab One account)

1.5278 18-23
1.5287 18-23 - this was a cash advance for CAD 150 - I think there is a USD 1 fee included - this is how I usually get foreign currency
1.5302 18-23
1.5268 22-25
1.5286 22-25
1.5209 24-27
1.5192 24-27

Citibank AA Mastercard

1.4853 29-29

Sylvia