Glad you posted. After I did my coolant pipe last winter, I monitored the temp @ between 100 and 105C. Just last week I got a CEL and P0128 code that indicates the engine is running too cold / too long so I monitored the temp on my drive home from work (about 30 miles 50/50 hwy/cty). It warmed up to 90C and stayed there cruising @70mph on the freeway. When I got into some lights, it only got up to 92.
I picked up a new thermostat but didn't get a chance to install it last weekend so going to have to wait till this coming weekend. Hopefully that fixes the problem; I figure the thermostat is stuck closed or has a leak.
I think 105 is probably the normal temp. I thought I saw that when reading through some similar posts.