I am actually thinking that what might be more interesting than a list of Vehicles is an approach to capture the World Building along with the vehicles. For Modern this of course is capturing existing products. For Sci-Fi tying the vehicles to the technology levels, manufacturing worlds, MegaCorporations etc. To me having vehicles defined as part of a world building exercise (even one very limited in scope i.e. with only a few vehicles) and would be much more useful to me as a GM.