Speaking of lurkers coming out of the woodwork... :-)
This image made me remember a great article in Car and Driver some years ago, where they reviewed a 797 dump truck. I assume the one in the picture her is bigger, but it's still fun reading.
http://www.caranddriver.com/article....&page_number=1
Fun stats:
Zero to 30 mph. . . . . . . . . . . . . . . . . . . . . . . . . .27.1 sec
At 40% load factor. . . . . . . . . . . . . . . . .65 gallons/hr, 0.3 mpg
Tim