Wanna ask your opinion. Versys-X 250 or Versys 650 for commuting, which is better? I know 250 can go around 140km/h max, but if riding at 120km/h speed will be at very high rpm, will it wears out the engine sooner? I assume 650 can cruise at 120km/h at lower rpm.

I don't want to risk it riding too high speed, at most 90-120km/h.

Ya, agree with you. Maintenance cost is a big factor as well. I am considering 250cc range because of fuel consumption and the range, probably might do a ultra long distance riding in the future, but I am not sure what is the advantage of 650cc except for more power, but more fuel needed. It would be nice to have more power to lug those extra weight from panniers and luggage into consideration as well when I am going to do ultra long distance.

I checked single cylinder torque is higher than parallel twin, but many reviews said the vibration from single cylinder is not comfortable.