Number of coffees purchased in Ontario

S      (about $1.33 each)
M     (about $1.52 each)
L      (about $1.71 each)
XL   (about $1.90 each)

In this simulation, you have won:

Yellow tab car (worth about $26000)
$5000 prepaid MasterCard
$100 Tim cards
Coffee or Latte (worth between $1.10 and $3.89)
Muffin/cookie/donut (worth between $0.89 and $2.05)
Please play again

and

Blue tab bonus car (worth about $26000)

Summary (before taxes):

Approximate cost of coffees:    

Scenario 1: Always redeem for a L coffee ($1.71) and a donut ($0.95), which is what I usually do.
Approximate value of prices    with a discount percentage of %

Scenario 2: Always redeem for the most expensive options ($3.89 for coffee/latte and $2.05 for muffin/cookie/donut).
Approximate value of prices    with a discount percentage of  %

So there is a huge difference in the discount percentage, depending on how you redeem your prices!