Thank you all for your replies. While DH is off on a hunting trip, returned loaner on his way south and picked up truck, don't know how it is performing. Will be anxious to see how it does mpg wise. He did tell me that the dealership, Ancira in Floresville, for you guys who live around here, said there was nothing wrong. He had also asked them to change oil and transmission fluid, neither of which had been done. They had had the truck four days! Go figure! Will have him read the latest replies to see if we can get any improvement if we implement any of the suggestions. He has ditched the K&N filter, which he installed at the suggestion of a friend.
