between 60 and 65MPH seems to be the most efficient for my car, however, it's also an automatic so if I slow down, it will downshift, I don't have a choice...However, I also noticed that at 65MPH I'm at 2100 but the minimal RPM for that gear is around 1500RPM but I can only go around 45MPH at that RPM....what gives? Maybe I'm just confused or something.
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