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Just got back from a 2100 mile road trip. Averaged 14mpg. I also had the ACC on at 90mph most of the trip. Not the greatest gas mileage, but man what an awesome road trip vehicle. 4 adults fully loaded all comfortable. BTW, the ACC is funny how quickly it accelerates to get back up to speed.
Don't waste your time and take it to a new dealer. If they can't accomplish a simple firmware update on the amp, imagine the damage they will do to your truck if you let them wrench on it.
RUN to your dealer with this TSB and have them do the firmware update on the amp IMMEDIATELY!!! HUGE DIFFERENCE. It will get loud now and make your ears bleed.
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