I tow a 7 X 14 utility trailer with an expanded mesh loading ramp that acts as a huge sail. I use this for my 100 pound kayak so it's likely less than 1000 pounds total. This gets pulled through the mountains here in Utah and the speed limits are between 55 and 80. It drops me from just over 20 mpg to as low as 12... For reference I have the 3.2 V6 TH with a Gobi stealth rack and it has lights, Hi-Lift, axe, shovel, two jerry cans, HAM antenna, and my spare tire mounted to it. I barely noticed a change in mpg with adding all of that to the top.