Hey guys.... I cant believe the horrible fuel mileage im receiving on my new 5500's. Im pulling a 16k trailer that used to be behind my 3500 (which averaged 10 mpg) and now im lucky to get 7.5. Usually its closer to 6.8 - 7.0 mpg. Any suggestions on how to increase mileage? Ive got two of them, and im loosing money every mile!!