Question for the people with CM870's

[Rtrucking]

So one of the questions is, what water temp are you guys seeing on your truck's, I can run down the road and only see about 175-180ish, but I'm thinking it's because of the truck I have (Rawez favorite old Antique iron type of truck) it's a 378 Pete with the oilfield cooling package on it and not lying it take 16 or 17 gals of coolant (I know not the best mpg or the best to the wallet), and what's the best range to run the boost at for better mpg for the 870's, I know the 871's it's best to keep it down at about 10 or less but I was just curious about it, then the last one when the water temp does come up to 195-200 range I can run with less boost and it just seems to run better.