I made something of a discovery recently too. I ride my Harley any chance I can and the other day I swear I passed through an area that smelled just like my garage! I immediately thought of this thread. It never occurred to me that bikers have an advantage over motorists in that they can smell the air they drive through. I didn't bother to investigate further, but I did have a laugh at my discovery as I drove through appreciating the aroma.