I looked on the inside of my driver door, and it gave me a weight of 4400 lbs. I know that's WITH the passengers, but exactly how many? Four? Five? I got a G-Tech Pro performance meter!!! In order to calculate horsepower, I need the exact weight of the car with me in it. It measures horsepower, 0-60 and 60-0 times, 1/4 and trap speed, lateral G's and cornering G's. It does it all with an accelerometer. Cool Huh? I got it free for buying BF Goodrich Comp T/A's. Anyway, let me know if you can.:-?