I have data!
Two different hills east of Billings on 90. Both about 5.5% grade.
Temp 75 f
Speed 47 mph
75k gross with a load that catches wind
10th gear at 1650
Elevation was 3500 and 4500, 2nd one was a bit cooler
Egt 920 f max, wasn't rising either
Oil temp in the sump hit 190
Coolant temp crept up to 195-200
Fuel rate is approx 28 gph. I will update this later after some math
I'd like to think those egts are acceptable, what do you guys say?
I'm not sure if the coolant rising like that is ok. I could see my rad needing to be changed.
Oh and this little adventure I had in winter when it was -30. Fuel rate would've been over 30, boost around 40, 65mph straight up an 8% grade at 50k gross
Flying up supertest at 50k gross - YouTube