What is with the $100.00 limit at the fuel pumps?

I wonder if these limits at the pump have to do with the change over to chip readers. I know that for other merchants the liability for card fraud switched from the bank to the merchant if the merchant didn't have chip readers installed by a certain date. For transactions processed by a chip reader the fraud liability is with the bank. The only chip readers at gas pumps that I can recall are the ones I used in Canada this summer.