I just gave the XFG a little spin around bl1 with bob's road going setup and an open dif. I tried to drive it pretty much like I drive my real car around a track (a 169 hp fwd with no dif) and I must say everything seems to behave pretty much as expected. Not too much wheel spin on the unloaded front tyre, tbh. Of course I modulated the throttle on corner exit a lot more than I normally do when racing in LFS, but that's what I do irl, too, slightly lift off when I get a hint of understeer/slipping front tyre. If the power band of the XFG is anywhere close to that in my rl car, I actually doubt that I would get much less wheel spin with it, even considering that it has more power (I mean, I never got below 4k rpm with the XFG, mostly above 5k, actually).
I'd have to to further rl-testing to absolutely sure, but for now I'd say LFS is pretty close to rl, at least not dramatically far off.
edit: don't mind the crappy line through some of the corners, I wasn't really trying.
