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My F-450 has hit 35-38 with me towing my trailer up hill or just getting up to speed. It says about 20 when I get on highway with out my trailer. That is about avr.
This is intresting, i can only find a 26psi min boost at full load and a the limit were the CEL comes on which is more than 58psi for more than 30 seconds.Can't find specific parameters