Good point, yes it does slightly, but still further in eco you can select internal air circulation which helps get the cold air recirculating quicker.The only thing to check is what drive mode you are in as this affects Aircon/heating performance.
No one charge there and back should be ample if your timing you stops between 100 to 130 miles. I’m driving to a Kingswinford from Essex tomorrow and plan two stops for a similar distance.I’m dreading a 230mile trip to Southend To see in-laws when lockdowns over. I’m guessing at 3 Charge stops