It's not uncommon to be able to receive a FM station several miles outside of its fringe contour, as long as there isn't another interfering station on the same frequency. You really need a good radio and antenna to accomplish this, which is the case for most car radios. Years ago, I was able to receive 106.1 WBBG from Youngstown in Broadview Heights, even though their fringe contour makes it just east of the Cuyahoga/Summit county line. This is impossible now due to the presence of W291BV, which wipes WBBG out completely anywhere within their fringe coverage area.
What's amazing is that I was able to receive WLFM-LP (87.7 FM) at almost 18 miles away after they were required to reduce their power to a whopping 3 watts, assuming that they were really operating at that power. Yes, reception was much weaker than before and barely receivable, but 3 watts probably had a max range of about a mile.