Cadillac has made opening the fuel tank door “easier”, but that has, in turn, led to a lot of confusion, and you’re not the first person to ask this question by a long shot. This spring-loaded latch design has come to replace the traditional gas tank door release lever found on previous Cadillac models.
While Cadillac states drivers can use gas with an octane rating of 87, it can cause lag in acceleration. They recommend using a premium unleaded gas rated 91 or higher for best performance.