Yes they last a long time, but there will be a dip in performance and mileage. 30k is reasonable, maybe extend upto 40k. Not more than that for our country.
Is iridium plugs designed for better performance/durability than fuel economy? A friend's verna was showing fuel economy drop (Already FE is pathetic in petrol verna, so a drop post iridium usage is again ).
Iridium plugs will definitely give better mileage as the combustion is more complete. Maybe your friend's driving style might have changed slightly because the throttle response is better. Or it can be a complete different factor affecting it.
The car is doing its occasional city runs. No performance updates or mods for now. The only mod left in my mind is better brakes. Nothing available as of now. Will be changing to Yoko S-drives as soon as possible. Better spec of 195/55 instead of the 205/50 that is there in the car presently. S-drives should probably have better braking than the accleara's that I have now.
Just regular city runs and nothing much to report. Tried Speed petrol from BP first time on the car. The car feels smoother at lower rpms now. Might be sticking with high octane petrol except when going long drives.
Nice review on my all time favorite Tiago. Keep munching your miles and also keep updating the thread for we fans, who could one day get hold of a Tiago in future.
Odo - 13219 Kms
Even though it wasn't time to check alignment, the car was pulling left side. So got it checked. The camber and toe values were out of the specified range. Got them corrected. I had a free check up available, but the shop was far away from my place. So got it done at a MRF centre nearby.
November 2021
Odo - 14000 kms
The car is running fine doing its occasional highway trips. Nothing majorly happening in terms of mods for some months. Will be planning to give the car for Full Detailing and interior cleaning as her 2nd Birthday is coming up.
Mileage Test. Highest I have got after I changed to these alloys.