As far as poly modeling is concerned I think you should be able to follow any modeling tutorial written for any of the big 3d packages Max, Maya, Lightwave etc. I used to do a bit of car modelling some time back, now I spend most of my time doing digital painting and low-poly models, but as far car modeling went I hardly ever used more than 7-9 tools (you can find my very old M6 on Blend Swap which I uploaded in 2009 I think) and I think that is the same for other kinds of modeling.
One of the first modeling tutorials I did was the old Joan of Arc tutorial which is a max tutorial, my first car one was also a max tutorial on modeling a fiat 500
Like Richard said study the techniques. The interface changes between 2.5 and 2.7 are pretty small so I think you should be able to follow those tutorials, but I would advise that you look into some of the modeling tool changes by going through the previous Blender release notes. Bmesh did add some important tools for hard surface modeling like bevel, inset etc.