sorry bhai i had lost this thread but now found it.
RPM seems high and we will attempt to reduce, but first lets get the basics in order.
Can u pls post a daytime photo of the engine ?
Q1. Do check the hose pipe going from the crank-case vent to the top of the combustion chamber... DOES IT HAVE any oil on it (it can be very clean oil and not necessarily black color oil) ?
And just take a close look on the engine, is there any oil spot any where at all ?
note: it is possible that oil drips, then covered with dirt (b/c you are frequently driving on highway/motorway).
Q2. With your driving conditions do you clean the air filter every week or 1000 kms ?
Q3a. What color is the smoke ? Does the color change when going from low to high RPM ?
Q3b. Is there any smoke when in the morning (when engine is cold) and no accelerator pressed ?
Q4a. As @Flyhigh1 asked, is there any knocking, is the car heating up, is radiator functioning OK ?
Q4b. And is the coolant getting consumed (are you adding coolant, when and how much quantity) ?