We average around 10 to 11 most of the time. If pulling hills it go's right out the window! If it is that big of a concern We don't know what Montana you have but maybe you need a smaller one. as everyone has said it's going to be different no matter who drivers the same truck on the same road every time!
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Bob & Carol Washington St
2017 HC HM352RL 2018 Dodge 3500 laramie CC LB 4x4
Curt Q25 with puck system, Factory air bags
Happy Trails
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