Ray 
2017 Toyota Highlander SUV Limited Platinum 4dr SUV AWD (3.5L 6cyl 8A)
Slow & Unresponsive!
 I have Leased/Owned a 2012, 2015, and now a 2017 Toyota Highlander V6 AWD Limited Platinum.  Even though the 2015 and 2017 models look somewhat similar (...minor changes in the lights) their power-train is completely different.  The new engine is good (more power, and yet more efficient) but the new 8 speed transmission is just TERRIBLE!  It changes gears too quickly and it seems like the car is always under-powered.  When merging onto the freeway, changing lanes, going up-hills, or ... there is a significant lag between pressing the accelerator and the vehicle responding!!!   Very disappointing... Much different than my 2015, or even the 2012 model.  Also, I get about 19-20 MPG for combined driving (... i do live in a "hilly" area though).  I hope this helps!