Hauling a load like this Hemi is child's play, even at around 600 pounds. The tires won't break loose as easily with this much weight in the bed, and the average 15 mpg stays with it. We've gotten an average of 10 mpg towing, and up to 17 keeping it at 55 and driving sanely. Sorry, that's not really fun. Our morning commute mandates 75 mph so we don't get hit from behind.