It does and it will and it's a very grey area. The car adjusts to all sorts of other sources; outside temp, coolant temp, engine temp, battery temp, cabin temp, draw on the a/c, what state of charge the battery is etc. If it's low the car will err more on trying to top the battery up and will switch the engine on quicker or earlier. If the battery is totally full as in 8/8 bars at the top end of that scale the car will run as if in EV mode right upto 45 mph (EV mode is normally 31 mph) with much quicker acceleration than the restricted EV mode normally offers and much more than the small amount of electric only drive you can 'force' by gentle acceleration. This is because the car desperately tries to burn off that excess charge. Once the charge reduces the car slowly starts to return to normal. You need a long, steep and fast hill for this to happen. I know of only one near me that it's guaranteed to occur on and I live in a hilly part of the world. You'll also get a slight insight into similar workings when you try and engage EV mode by pressing the button. When the car is cold (relatively) EV mode will kick out at 20 mph. When the car, and importantly the HV battery is warmed up, the car will allow EV mode to be selected upto 31 mph. But if the battery gets too warm or is used too often or the a/c is on too high, it won't allow you to select EV mode full stop. It's a very well designed computer program with many many variables, hence why it is said that one should leave the car to decide what is best for economy as you can't fool it long term.