The typical cash discount at any gas station in California that I've seen is 10 cents. I get 3% back on gas purchases from my credit card. Question: At what p

The typical cash discount at any gas station in California that I've seen is 10 cents. I get 3% back on gas purchases from my credit card. Question: At what price per gallon does it stop making cents (heh) to buy with cash? Hint: California hasn't had gas at that price for many years already.