After 5K kms thought I should check the condition of plugs. Vehicle Suzuki Swift 2014 Plugs Denso IK20. Plugs installed approx 1.5 month earlier.
After closely observing the plugs, I have come to the conclusion that perhaps the iridium alloy has self cleaning capabilities. The whole plug had little bit of brownish carbon which is very normal but the iridium tip came out clean and shiny as shown in the pictures.
There is considerable enhancement in engine output and improvement in consumption after installing iridium.

