Originally Posted by Callisto

This is pretty much spot on information^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ You just forgot to add that the ECU will protect the engine and not let it over RPM in any gear and also there are MPH limiters set as well.



Or you can do-it-your-way!
*In my Mazda I can run the engine speed (RPM) as high as I want and also the shifting in manual is completely under my control if I go into sport mode! That mean any MPG any gear I choose! I don't like auto manufacture controlling what I do to "MY" cars!

VT mapping is not recommend to adjust to anyone not knowing and fully understanding what they are doing