Take your gas cap door off (not sure if it comes off easily on the GVR4) or some other body panel and bring it into your local auto parts store. Make sure that the gas cap door (or whatever part you bring in) is clean and polished etc so you have the best chance of obtaining a match.
Look at the rattle can cap and match it up. I have touched up a few cars this way so well that you really couldn't tell I did it. Since no one here seems to have taken a chance doing this yet, I wouldn't bother. It is just too much of a risk and hassle for me. I would just go to that automotive touchup website the last poster posted.
I have used their paints on several of my cars and it matched perfectly, except when I tried to touchup paint on my Infiniti G20 (Starfire Blue Pearl).
The paint would not match and it stayed extra dull even with clearcoat, wet sanding, and buffing. They wouldn't stand behind their product either, so be aware of that.
If you decide to take your chances, please let me know how it turned out. Post some pics. I am cheap when it comes to this stuff as well. I also have enough experience with this stuff to know that I don't want to deal with extra hassle if it turns out wrong..