[JMD]

When figuring your mileage while towing, I think that it is important to figure how much wind your trailer is pushing and how areodynamic or un-areodynamic the trailer is.

If you have one guy pulling a flatbed of newspapers with a total combined gross weight of 24,000 lbs and a total loaded trailer height of 4', and another guy with a 12' tall van trailer with a with a total combined gross vehicle weight of 14,000 lbs hauling fiberglass insulation, both traveling on the same route at the same speed, I am sure that the guy with the heavier load will get quite a bit better mileage than the other.

The areodynamics of the vehicle in total will play more into the mileage than the weight hauled, and the worse the areodynamics of a given vehicle, the more towing speed will effect fuel mileage.

I see lots of posts about how much weight is being hauled, but little information on aerodynamic issues that would have a huge impact upon mileage.

This makes what seem like simple comparisons on mileage atained by different folks on this form much more complex.

Most of the trailers I pull are about 12' tall overall, and 8.5' wide. I
have had most of my trailers built to be as high a cube as practical considering that I intended them to be towed behind 1 Ton trucks.

I average about 8 mpg with these trailers (at speed) and the DM. I would expect most travel trailers, toy trailers, and small car haulers to do a little better mileage wise than my combinations, due to these areodynamic considerations.

So in other words when looking at mileage claims over the internet (or in the local cafe), you are not comparing apples to apples most of the time.