I run Costco gas in all of my vehicles. One is a twin turbo EcoBoost, one has the highest stock output of any 4 cylinder engine made (single turbo) and the other has a 1.7 liter supercharger sitting on top of the engine. I cannot imagine running anything but 93 octane (91 in a pinch) gas. I've been known to top off before leaving the track with 94 or 95 octane, if available, before leaving to drive home. The Honda Ridgeline runs fine on 87.