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
Not a very scientific justification, but I only use 91, not because it needs it, but because that's the only grade I can get without ethanol, the addition of which was a crappy idea in the first place. IMHO.
