I can answer 3 & 4 real quickly...
You can get that continuous beeping disabled to a single beep by the service center (only). Look up Lexus Personalized Settings (LPS)...all kinds of other things you and the service center can do.
I drive in Eco Mode all the time. It won't get you speeding up a hill with muscle power, but it's enough to speed past slower drivers in front of you. I've compared it with Sport Mode...and...umm...not sure. I can't feel an immense amount of power increase, but I can feel a little bit.
You can get that continuous beeping disabled to a single beep by the service center (only). Look up Lexus Personalized Settings (LPS)...all kinds of other things you and the service center can do.
I drive in Eco Mode all the time. It won't get you speeding up a hill with muscle power, but it's enough to speed past slower drivers in front of you. I've compared it with Sport Mode...and...umm...not sure. I can't feel an immense amount of power increase, but I can feel a little bit.