I'm wondering is there a quick way to get the factory weight of my car via vin, build sheet etc



With leather, heated seats, sunroof, Jcw calipers, full climate control
the book number could be 50-100 kg out

I'm not sure my local weigh bridge is calibrated to tight enough tolerance to give a meaningful result

 

Best way is to take it to a race shop, they generally have accurate scales. A lot of the truck stop scales are fairly accurate too. They have tolerances they must maintain to remain certified. Mine is down to 2700 lbs with a half tank of gas. I probably won't do much more to reduce weight since it's my daily.