It is quite heavy, with the civilian version weighing in at 3.4 tons. I wouldn't want to hit a Hummer with my Hyundai. Then again, I could buy six Hyundai's for the price of one basic , stripped Hummer. Since 1973, speed limits have gone back up, as have personal driving miles. Reduced fuel consumption of petroleum products is no longer the issue.
Increased consumption is.
It never was. Would it not have made sense, back in 1973, when polluting diesel engines became popular in an attempt at driving with cheaper home heating fuel, to establish alternative fuel laws with teeth that really made a difference. Not, if the goal was more fuel consumption instead of less. Imagine the conservation that would be realized. Imagine the decrease in pollution.