Since I am old, old, old school, I am going to run a test for better (hopefully) mpg's. I have been reading quite a few posts on it here and elsewhere and the one thing I come up with is that the so-called sweet spot is around 2500 rpm's. Since I do a lot of driving around town, I just filled the tank and am going to disable the overdrive. I am tired of bogging up hills and the tranny downshifting all the time. I have better power and pick-up doing this so far and hope all works out for the best. I will give an update on the results after a couple of tankfuls. If this has been done before, let me know how it worked out. I don't have a scangauge or other instruments to use at this time so, it is by the seat of my pants deductive reasoning, trial and error going on here.