I would like add to my above question, I drive very carefully. My RMP never reaching at 2.5 Plus. Most of time try to drive at 1.5 RMP to find a better MPG but My Santa Fe has decided not give better than 7 to 7.2 KM/ Liter.
I was driving my Santa Fe on Jabal-e-Shams Oman. I used AWD lock and put my car in 1st gear (not in D mode). In a sharp steep ramp when the car was going down, RPM reached at 5.5 but the speed was under control only at 25 to 30. When I move gear to 2, the speed reached at 80-90 but RMP was at normal. I used heavy breaks to reduce speed.
Is it OK to drive at 5.5 RMP? What will be the effect on engine?