I went down to the local truckstop and used their CAT cerified scale to get an accurate weight for that dyno software I've been using. It came out at 3600 lbs on the money including me and about 0.8 gallon shy of a full tank of E85 (I went full since I usually tune with quite a bit of fuel in the car).

The math works out to:
3600 lbs
- 162 lbs (me)
- 115 lbs (A full (usable) tank of E85 (17.6 gallons))
+ 5 lbs (E85 I used to get there (11.4 miles))
__________________________________
= 3328 lbs with the low fuel light barely on (est)

24 lbs lighter than I thought she was.