Hi i have a 18 with less than 5k on it a G56 i am getting 11mpg pulling my 20 ft stock trailer loaded about 10k and avraging 16 empty. I was wondering if that mileage would go up much after a full delete and mm3 from ray that i have already purchased just havnt installed it yet because i hate to ruin my warrenty. My 09 didnt get good mileage at all untel i deleted it and then it woke right up i would get 14mpg pulling my trailer. Just curiouse if these 4th gens reacted the same way.
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