Drove about 15 miles today and stopped at Home Depot to get a infrared temperature probe. It is only 88* out so things were fine. The gauge stayed between "E" and "M" the entire time. When I stopped I left it running and the top tank was 180* and the bottom tank was 166* or so. So I'm getting good cooling across the radiator (I was also thrilled at how well my small trans cooler was working). Maybe it'll really warm up this afternoon and I can try to get it to overheat.