EDITED TO REFLECT ADDED SPARE WEIGHT:
So, 4998 lbs - 300 lbs = 4698 lbs w/no driver
22 gal X 1/8 = 2.75 gal fuel
2.75 gal X 6 lbs/gal = 16.5 lbs fuel
4698 lbs - 16.5 lbs = 4681.5 lbs
4681.5 lbs + 59 lbs (spare) = 4740.5 lbs
Now all we have to do is add in the weight of the spare to properly compare AWD to 2WD. Who can weigh their spare to get us this number?
Edited to reflect added spare weight:
AWD TBSS WET WEIGHT (all fluids, no fuel): ~4740.5 lbs.
2006 TBSS Silverstone Metallic 2WD LT