I am looking for comments and performance data on mpg changes when purchasing and installing a Stealth Module on a 2013 Powerstroke Turbo 6.7 I am averaging around 13 or so in town and 15-16 on highway. I will be towing a 14,000 lb. 5th wheel from Michigan to Arizona in end of December and would like to get better mileage. Pulling trailer from Virginia to Michigan in September, I averaged between 8.5-10. Truck has 99,000 miles on it, and will not spend 2500. to delete. Would like to keep stock.