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The overdrive button turns the overdrive off, which is to say it keeps the automatic transmission from using 4th gear. I use this all the time in the mountains when I am going up a hill and the transmission cannot decide between 3rd and 4th, or it stays in 4th gear and I just end up slowing down. By turning overdrive off, I stay in 3rd gear, my RPM's go higher and so I have more power to continue my speed or accelerate up a hill. The manual actually says to leave overdrive on to improve fuel economy and turn it off when needed. Think of it as a 3rd/4th gear shift button.
As far as the ECT Power button, that changes the shift point in RPM's (or speed depending on how you look at it) between gears. Again, I find this helpful going up steep hills and need to keep my momentum going. When the RPM's shift at a higher point, you have more speed and so when you get to the next gear, the engine won't bog down.
I do sometimes use both buttons at the same time.
Prerunner with TRD is exactly what I have. Essentially it means you have a 2wd pickup with the look/stance/ground clearance of a 4wd (Prerunner part) and the TRD package gives you upgraded suspension, bigger tires/wheels and in some cases a locking differential option. The differencial option is only on the 6 cyl model I believe.
Hope this helps.
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