sometimes.. usually it's either a diesel car or, now that the weather's getting cold again, the smell of a really cold gas engine (i.e it's running rich). This is with a Prius without plasmacluster. The sad thing is that I just automatically shut the vent every time I see a coach or a large truck (like those carrying sand/stone, concrete mixer, semis etc) just because I know it'll come into the cabin.

Mods: EV mod, VVT-i emblem, sport pedals, OEM cargo mat, JDM Prius interior footwell lighting, Sylvania Silverstars 9003ST, DICE iPod kit, OEM all-weather mats, TomTom ONE v2, LED licence plate lights.