With the manual 4th gear carries u up to 120km/h with ease (meaning good acceleration) and rpm can go up to 4000 but when in 5th it reaches 140km/h and then slowly climbs to 150-155km/h max and rpm seems as if it's limited to 3500. Maybe that's ur answer Wheel size and diesel quality can also affect...
Driving behind me with your Bright lights on is the worst, this seems to cause a headache[PERSEVERING FACE], and difficulty to see ahead also as the entire inside of the vehicle does light up.