Re: Please advise ASAP NEED HELP
Gross Vehicle Weight includes the vehicle plus fuel, cargo, passengers and driver. Gross weight and max weight are different terms for the same thing.
Dry Weight, which I assume is the same as Light Weight, is the weight of the empty vehicle with an empty fuel tank.
To get the "as built from the factory" dry weight, multiply the number of passengers your bus is rated for (plus the driver) times their average weight, add the weight of a full tank of fuel and subtract that from your GVW (10,000 lbs) and you should be good to go. If you want the actual dry weight, fill your fuel tank, empty out all cargo and passengers then drive to a truck stop and get it weighed on their truck scale. Subtract the weight of the fuel and your weight and you have your actual dry weight.
I don't know what the DMV assumes for average passenger weight, but gasoline weighs 6.2 lbs/gallon and #2 diesel weighs 7.15 lbs/gallon. Water weighs in at 8.3 lbs/gallon. The Federal Transit Administration used to assume 150 lbs/bus passenger but there was a proposal in 2011 to up that to 175 lbs.
It all depends on how picky your DMV is and whether they'll accept your "unofficial" numbers.