[tempetom]

I think something's wrong when you get less than 17mpg with cruise and only going 70 to 75. Around 6 months back we had a thread going and I posted my mileage on a trip to NC and back with a brand new truck. My best tank was 18.5mpg but that was near Atlanta in a serious rainstorm when everyone was driving about 50mph. My worst was about 14 in West Texas when most of the driving was over 90mph. My average when driving between 75 and 85 was about 17,4mpg.I'm not sure what to check, but I always suspect brakes hanging a bit when the mileage goes way down. I'm pretty sure the dealer won't help you though. I also know how to calculate mpg.