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..
We have found that in the MH I must push hard on the throttle using the 85 octane. We stay with the 87 octane. We get a little better mileage with 87 over the 85 octane.