Seems like having the load stuck up above the bed would really cut the aerodynamics of the truck and make it get worse mileage than a load that roughly tapers down in the back behind the truck. At least for over 30mph or so.
Got any numbers on the better mileage of towing 2 atvs like that compared to in line or side by side on a trailer? We like data on this site so if you have any tests done please let us know of the results and if you are willing to help someone here try and duplicate the test.
There are a lot of people that use similar setups to haul an extra 2 atvs on their trucks around here and from what they say it kills their mileage. I have never gotten actual data though so it could just be them complaining about their trucks crappy mileage in general.
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