Bushpilot is correct about a 12 speed smart/auto shift being superior to the 6 speed. With the Allison 6 speed you must pick your highest gear based on the driving conditions. In town I use 3rd or 4th as the highest gear it can choose based on the speed limits. With the 6 speed one has to consider the RPM range, whereas a 12 speed will be more precise based on the engine drivetrain consideration. Our choice was driven by the economics of the coach and how many miles we drive each year. Life is nothing but constant compromises.
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