My Universe is Now Six Cents Off

I had made plans to crow about the symmetry of my universe--but now my goose is cooked.

I love Diet Cokes and stop for them often. For the past several months, McDonald's has been selling any size fountain drink for just a buck, which comes out to $1.06. Meanwhile, RaceTrac (my neighborhood gas station) sells their "just my size" self-serve sodas for $0.94. So coming or going, I'd use a buck and get six cents back, or use a buck and share the six cents. It was wonderful!

Alas, McDonald's has pulled their promotion. Today I was in dismay when I payed $1.72 for my Diet Coke. I'm really not sure what to do.