FYI, they won't test the gas and void your warranty, that's BS. On the other hand, I'd stick with 89 whenever you can, as that's what the engine is designed for. Always best to follow factory recommendations, especially for a specialty model like a Mopar '11! As proud owner of Mopar '10 #483, I can tell you...nothing but the best fuel, best oil, best filters for my Mopar!!
JS
76 Dodge Adventurer Sport Power Wagon W100 318, 727, NP203 Fulltime 4x4 Russet Red 06 Jeep Commander Ltd 4x4, 5.7L Hemi, QuadraDrive II 06 Chrysler 300C AWD 5.7L Hemi 10 Mopar 10 Challenger R/T, #483/500, 5.7L HEMI 10 Jeep Grand Cherokee Ltd 4x4 5.7L HEMI 11 Dodge Ram 1500 LoneStar Quad Cab, 5.7L HEMI, Fulltime 4x4, Deep Cherry Red 16 Jeep Cherokee Limited 3.2L Pentastar V6, 9 Speed Torqueflite, 4x4, Black
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