What gas octane???
Users of the big gassers: Dodge 6.4, GM 6.0, Ford 6.4....... Can the lower octane be used or do you need the higher octanes????? Colorado we have either 85, 87, or I think 91..
Forum Discussion
My truck was designed for 87 octane and usually when crossing the country that usually means switching to mid grade once I hit mountain country, as tge octane drops across the board (lowest I saw was in Dayton, Wyoming sporting 82.5 octane regular)
