So my question is fairly simple. Which one hurts mileage more EGT or RPM? I drive 37 miles one way to work and am able to cruis for 20ish miles at 50-60MPH. I have noticed that doing 55 in overdrive my egt's sneak up above 600 sometimes up around 900. I will be cruising at 1500 RPM. I can lock the OD out and my EGT's drop to ~450 but my RPMs jump to ~2300.
Normally I would do the testing and report. A single tank load each way (100 gallons). But I won't be able to perform the testing for a month or two. I have some things I am tweaking with my fuel system that would make it impossible to establish an accurate baseline. Not to mention the validity of any data would be suspect with the change of fuel pump and additional filtration in the middle of it.
I was curious if anyone had done the testing - I know you always say keep heat down and RPMs low. I can see an argument for each being more important.
As soon as I get the fuel system locked up I will do the testing.
On edit - not to mention that my fuel additive choice (SVO) makes my truck less than an ideal test bed for the masses