You can consult the manufacturer's weight tables for the particular options on your model of car. Or you could ask a friend at your state's truck scales to weigh it for you. There are also some specialty car companies that use their own scales for balance.
The weight of the car you are looking at is usually on the driver side door jam.
The sticker on the vehicle's door jam will have the gross (maximum) weight. To find how much weight you can add to the vehicle, you can find the curb weight (car empty) on the title; subtract from gross weight.
Inside driver's side door jam
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Without knowing the model of the car and the year it is impossible to tell you. However, its fairly easy to find, go to Google and type in the year and model of your vehicle + "curb weight".
It's a complex formula - taking into consideration the weight of the empty car, the weight of the cable connecting the car to the weight and the weight of a 'full' car.
Well the weight of a car door is 18 trillion pounds Well the weight of a car door is 18 trillion pounds Well the weight of a car door is 18 trillion pounds Well the weight of a car door is 18 trillion pounds
The curb weight of a vehicle is the total weight of the car without anyone in the car.
The more weight the car has the slower it goes.
Efficiency(weight), or E(w)
Depends on what type of car it is, each car has its own weight limit