Just want to get feed back from anyone with regard to using 87, 89 or 92 premium plus in the Madas. Depending where you live these days, a 28 gallon tank can be pretty costly at the new feul prices. Dealers are indicating that the 305hp-5.6 Armada engine can handle 87 regular gas. That kind of scares me for knocks and pings in a high compression V8 engine. I can't imagine it would burn efficiently or give the same performance as the 89 octaine or higher. I just have not seen any info regarding the use of 87 octane. Does anyone know whether there is a recommendation to use the 87 octane fuel? Any feedback is appreciated.