So we're in Florida, made a 5.5 hrs trip to the beach. 93 octane with star tron fuel treatment , full load in the bed and my 240lb dog, wife ( no I'm not dumb enough to list her weight lol) daughter and myself (215lbs). Running an average of 65 to 90 the entire trip. 15.3 mpgs. Not to bad really. The performance tune I have from 5 star also.