Over 28,000 miles and two years I recall mostly 2-2 bars. rarely does it lose signal but almost never does it seem very strong. The browser is so slow that I almost never use it, I use my phone or tablet for anything I need in the car with rare exceptions.
This is one of my few serious peeves with the car. I agree we ought not to be browsing while driving but we do need things like Waze, local information and so on. That stuff should be coordinated with the Navigation system too, which is my other serious peeve with the car. Luckily my phone/tablet can do all that, but...