Calculating Volume

[Brandeeenie]

Hello,
I've been having trouble calculating the volume of an irregular object, I am attempting to calculate the volume of the Hyundai I30, i've tried using the volume measurement displacement method but obviously the car is too large of a scale to do so can you please help?

 

[HallsofIvy]

It probably would also not be a good idea to immerse a Hyundai in water!

How accurate do you need to be? You can probably approximate a car with a collection of rectangular solids.