I got an S in December with the premium upgrades. The HEPA filter works great 99% of the time and I don't smell any gasoline fumes But whenever I inevitably follow a truck with horrible emissions that's visible as smoke, I can quickly smell that (and it's not just a little bit of smell; it actually smells horrible). Turning on bioweapon defense mode makes no difference and only makes the smell worse. I always have the A/C on, and of course, my windows/sunroof were closed. Is this normal with the HEPA filter or should I have Tesla check it out for leaks and stuff?