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Message: [QUOTE="Humphrey99, post: 353451, member: 5052"] Just got back from a trip where I towed anything long enough to figure fuel mileage and I was shocked to see 8 mpg average. Here's the run down... I've got an '08 CCSB, auto, 3.73's, auto, all stock set up w/52k miles. I get around 14.5 mpg doing my normal driving. I've only had the truck about 6 months and I've pulled some trailers some shorter distances but this trip was 670 miles one way so I got a chance to really do some towing. We pulled a 16' flat nosed cargo trailer with 2 4-wheelers and an off road go cart so the load wasn't terribly heavy. I figure it was the flat nose of the trailer pushing the wind that hurt us the most. With no wind on a long flat stretch, I was running 70 mph, 22 lbs of boost and got 9 mpg. Once we hit some hills or wind it went down from there. We averaged about 8 during the entire trip. So, is that typical numbers for this set up? I could have got 8 mpg with a gasser and paid less per gallon. I knew the 6.4's weren't the best on fuel, but I was expecting somewhere between 10-12 mpg pulling. I changed oil and fuel filters before leaving and air filter was in good shape. Should I be looking my truck over to find out what's wrong or is this just what they get? On a possiive note, it was a comfortable ride and the truck had the power to pull the trailer as fast as we wanted to go, as long as we would pay for the fuel to do it. By the way, we went out to shoot prairie dogs out in South Dakota. We had a lot of fun as usual. Here's a couple vids we made of trips in the past if anyone is interested.... [url]http://www.youtube.com/watch?v=1ZB2fynHvSo[/url] [url]http://www.youtube.com/watch?v=pnIWbzYfNVM[/url] [/QUOTE]