When to shift?
So I was going for a long run (like with feet, not driving for a long time), and got to wondering ... If I am going, lets say 40 mph, for a while, if I am in 4th gear my engine is right at 1500 rpm (about the peak of the torque curve of some dyno sheets I have seen of about stock 7.3s), would I get better fuel economy staying in 4th or shifting into 5th and running at about 1100 rpms?
I have read, from many different sources, that an engine is most efficient at the peak of the torque cure. Would that translate to getting the best mpgs at that rpm, or would it be better to bet traveling the same distance with less rpms and the engine not being at its most efficient state.
Also, completely different topic, if you released all the pressurized air in every tire, ball, compressor in garages etc., would the air pressure of the atmosphere increase at all?
97 F-250 ECLB ZF5 7.3 4x4, 6637 Filter, MBRP 3" to 4" with 5" tip, HPO xover pipe, shimmed FPR, Boost and Pyro Gauges, PHP chip with stock, 60 hp, 80 hp, 140 hp, high idle, and no start