I did some digging around and calculating, Tim Hortons coffee has an average of 0.36mg/ml of caffeine.

On the other hand, Starbucks drip coffee has approximately 0.70mg/ml, almost twice as much!

No wonder an “X-Large” cup of “Timmies” never keeps me awake.

Ps. I did not want to make this a Tim Hortons vs Starbucks issue, but McDonalds (Tim Hortons’ only real competition in Canada) does not post their caffeine content online. Home brewed coffee varies depending on your personal preference.

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Sources:
http://www.timhortons.com/ca/pdf/caffeine-canada-en.pdf

http://www.starbucks.com/retail/nutrition_beverage_detail.asp?selProducts={CE5B1860-C0CF-434A-864E-604185E56724}&x=35&y=13&strAction=GETDEFAULT