First of all i hate nothing more than people who steal our fine ass cars, and i know that they just treat it like crap anyway.
I wouldnt be putting up any posters though, dont know what the area is like but if there isnt to many servo's around maybe get them in on it, he has to fill up sometime just a matter of where.
Anyway all the best in finding the car, if ya get him before the cops do give him a royal beating