obviously, as soon as I replaced the air filter and I knew car is moving light.... it is light now, and it might help with the fuel consumption as well because you get a general sense if you are a daily driver that how your car is feeling....
on top of it, it was due since long and one thing which ensured this time was that genuine products do work best besides they do cost you an arm and leg....
The air filter I put in was of Rs. 1850 and even it was available of Rs. 200 in the market, Rs. 200, Rs. 450, Rs. 800, Rs. 1600, and then this one Rs. 1850. Most of the people would get tangled in above figures and try to abstain from purchasing a filter of Rs. 1850 if it is available in such a "low" price 
Same was the case with fuel filter. Malaysian was available for Rs. 1650... but..... 