The online racing simulator
If car has a car behind, it should benefit in speed a bit
So that's pretty much how Nascar works. Nothing new tbh. But yea it would be nice to have something like that in LFS.
Of course this effect can't be added in artificially, so we'll have to wait for an updated aero model, which will probably (hopefully) include underbody areo effects and breakable wings.

FGED GREDG RDFGDR GSFDG