how much will a 2007 Pontiac G6 convertible be worth in 2009?

Question

it has good milage on it

Answer 1

A good rule of thumb is that a 3yr old car is worth 1/2 of a new one. This is pretty general.

Ask what the buyout would be if you were to lease one until then. The people who make this their business will have it figured out pretty close.