I've made one road trip Oconomowoc, WI after switching to Project Fi. It was in late winter due to my Grandfather passing away. So, I wasn't running speed tests or checking which networks had what signal strengths were. What I can tell you I had no issues running navigation, Escort radar app, gas buddy, SMS, and phones calls during the weekend trip. From looking at coverage maps it should be even better since US Cellular shows coverage of south eastern Wisconsin. They hadn't even announced they would be joining Project Fi at the time I made the trip.