Question about weight

Well I am no expert thats for sure. It does seem like when people put there cars weight up on here it can very a lot depending on options and even how much gas they had in the tank when they weighed it. I put my 340 4 speed Dart on the scale. 8 3/4 rear full tank of gas and a full size rally spare tire. No option car with no glass or aluminium prts and a full int was right at 3330 pounds. Not to bad realy. I have sence cut a little weight out of it and it is around 3250 right now.