My ertiga is done more then 8k now & its running very smooth. I have done two changes
1. upgrade front speakers with Pioneer component (speaker + tweeter).
it will improve sound quality & high end is now more clear due to tweeters .
as i am not using amplifier so boss is not good.
planing to add 4 channel amp & a sub woofer only issue is boot space that feel sufficient to add a sub-woofer box.
2. change cabin dome light to led (16 led light).
changing bulb with LED give great result, More light in cabin & its white so feel cool.
& power consumption is also very less only 0.5 watt LED while bulb have 10 watt power consumption so changing both bulb will save 19 Watt power
car returns 17.8 kmpl in 80% of city drive.
LED is super bright & feels great. gives more light then normal bulb.
Tweeters are fixed where OE tweeters come.