2000 v40 with 82k miles.... This car has had all scheduled maintenance and always garaged in a dry climate... Recently my car (owned since it was new) has started a "droning noise" when over 50 mph....annoyingly loud. The last time a replaced the tires I put on steel belted radials, wondering if these 2 year-old tires could be the cause of this noise? Struts were replaced a few years ago. Car has performed really well over the years (driven very carefully/conservatively) Anyone else experience this droning noise? Thanks in advance for any info...