You are partially right about this. Many larger vehicles have larger tires which allow for a greater surface area which contacts the road. For instance, the tires on my truck allow for such a greater amount of surface area that they actually have a lower PSI value than the stock tires for the Civic given in the example. This may not be an across the board statistic, but it is a factor to consider.
One thing I just thought about after writing that just poped into my head. Have you ever been driving on the highway, or even in a bumpy/hilly road and noticed those scratches in the pavement? You know the ones where some body bottomed out their transfer case or something? What percentage of those scratches are caused by SUVs and light trucks? I would just guess and say they were mostly made by cars and other lower to the ground vehicles. That's just my guess now. :p
I guess Manny can talk all the he wants. His vehicle gets a million miles to the gallon.