I agree with Lars 100%. When I tow my trailer up a long hill (like the passes in the Colorado Rockies, or the 8000 foot climb we'll be doing tomorrow when we take our 3600# trailer up to Mt Graham here in AZ), I regularly see 214-216 on the CHT. I simply don't monitor the ECT, since it's inferred. And, like you, my dash temperature gauge NEVER moves above "slightly below the halfway mark".
If you want a real thrill, monitor the oil temperature (if you have that capability). I did for a while, but it was bad for my nerves, so I quit.
- Jack
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2024 F150 Platinum SCrew 3.5L PowerBoost FX4, Peragon Tonneau Cover, LineX Bed, 35% Window Tint on All Sides and Rear, Full Nose Paint Protection Film, Husky Mud Guards, Lasfit Floor Liners, VIOFO Dash Cam