 The 2018 XLE is rated at 39mpg highway but I am consistently getting over 43mpg. As for the head unit, it does not require that you plug in your phone to use GPS like Android Auto. The Scout GPS app works over a Bluetooth wireless connection for Turn-by-Turn nav and voice directions (this is all I ever need).  Toyota does need to improve/update the maps to make them better. The directions can get a bit off at the end of trip when you are going to less popular destinations making it less reliable than Google maps, etc.