Don't take weights very seriously(especially if you use a large truck scale). I weighed my 1LE with 1/4 tank of fuel in VA and it was 3815. After moving to SC I had to weigh it again in SC and it was 3942(again with a 1/4 tank).
That is a difference of 127lbs with an identical car and fuel level.
The scale in VA had a calibration sheet posted but it was almost 3 months old. The SC scaled guy said thier was recalibrated "just a couple weeks ago".