Was your roofbox off?
My car weighed the 3850 or whatever it was supposed to weigh (B7 S4 Sedan) with a full tank of gas.
Your car weighing 3940 lbs with 28 lbs wheel weight saved, 30lbs battery weight, 20 BBK saved, 50 lbs gas saved but with 20lbs of stuff (so 108 lbs weight saved) the car’s ‘normal’ weight without those weight saving items would be 4050 lbs.
Not sure how right that is. I thought the Avant was around 150 lbs heavier than a sedan, which would mean 4000 flat. Not far off though.
p.s. your exhaust is most certainly lighter than stock as well…so your car is even heavier than we thought. Probably saved 35 lbs on the exhaust…so your weight is actually around 4080. If the avant is 200 lbs heavier than sedan, that’s a pretty big difference. Equivalent of a full sized male passenger…which can mean a car length in a pull on the highway or almost 2 car lengths (2 tenths) at the dragstrip.