troyfoo

it make sense in most cases but got to remide you a litte more detail in these 2 areas:
（四）高速行駛時，要將窗戶關上，減少風阻，節省汽油。
      for most of the car sell in europ or america they usually put a redline at the speed of 55mph 90km/h that actually remides you if you drive at that speed it's the best ultimate speed for saving gas and also below this point you can actually keep your windows open since the aerodynamice dosen't really affect the car below this point and for ranything after this it is better for you to turn on the ac instead of the windows open cos of the friction and the aerodynamic will do a lot of work to the car starting by thsi point

五）避免引擎空轉，如遇上塞車，短時間內無法行駛時，應關閉引擎，一方面省油，另一方面可維持空氣潔淨
    for this actually it's not really turth at all if your car is not build for this then don't even try this cos you are jsut starting more and more times that will bring extra load to the engine and actually when you start the engine it will cost you more gas to start it up than leave it in idol for 3 minutes the ratio is getting bigger if you got a 3000cc and + vehicle
      and thos hybrid vehicle are having a engine that is specially build for this and usually they start the engine when the car is moving so it woun't cost them extra gas to fire it up and most of the hybrid vehicle with good fuel efficiency they got a small engine only