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As to shifting at higher speeds, any automatic will do this when you get on the throttle. The closer you approach "wide open throttle", the higher your shift points will be. The assumption being that if you are mashing the accelerator pedal that far then you intend to, well accelerate.

Pushing your vehicle harder than needed isn't ideal, but we all do it sometimes. In regards to why it sounded like it was cruising at lower rpm at 55 after is because it was at a lower rpm. Assuming your '08 is all stock: you said you were getting into 3rd over 40 mph. 4.56 gears in a 1.48...