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My corolla I can get to shift around 2k rpm (no rpm gauge, so I don't watch it on my scanner very often). I get it to shift into lockup (automatic) at around 43mph, and hold the gear down to around 39mph before it down shifts. 45mph = ~1600 rpm and 50-55mpg instant readout.
I'm not sure about the other brands, but I have read about people that offroad their toyota trucks overriding their ECU and adding in a 6 way switch to manually shift the electronicly shifted auto transmission. You just have to add dummy loads for the ECU to be happy.
Their setup normally is:
1. ECU / factory setup
2. 1st gear
3. 2nd gear
4. 3rd gear
5. 4th gear
6. ECU / factory setup
and a seperate switch for lockup. Been wanting to this this for a while, but haven't yet.
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