Calculating Automotive Engine Power: Load Capacity vs Dry Weight

[adidavinci]

Hi veryone this is my first post...
i am given with 2 datas-they r load capacity=250 kg; Dry wt of vehicle=150kg...I have a doubt...when we r calculating the power of an automotive engine, which wt. shud be taken for calculation...or should we takje the sum of them?

 

[brewnog]

Well if the vehicle is laden, take the weight of everything there. If your lorry is full of bricks, they'll have an effect on its performance.

How are you using weight to calculate power?