So let's say somebody has a "pump gas" engine built to run on 93 and it might be at the very edge of safely running 93 (unbeknownst to the owner since they didn't build it), takes said engine across the country to somewhere where the "premium" gas may not be as good as their state's, like Oregon or California where their top tier is 91 and may not be the quality of gas the engine was built for. This is exactly why I say there is no generic, cut and dry pump gas definition that works across the board. Even e85 has been proven to be of different ethanol content across several stations. I have had issues with one stations 87 vs another station, and that's local to me. My opinion, the pump gas terminology has to have a qualifier, it can't be generic.
