The primary point where i am interested in changing the SPARK PLUGS is to get better milage. And also the SPARK PLUGS of my car are going to EXPIRE soon.
A SANTRO owner clearly claims that his car RUNS 15 km more on a full tank of CNG after putting these plugs.
i just installed bosch 4-tip plugs in my santro. Santro has an efi system & i run it mostly on CNG. The pick of my car is now like i am running it on petrol, even with the AC on. Mileage improved by 15 km per tank full of CNG
Also SPECTRA owners confirmed this in another forum.
So it represents economy.
And who doesn't wants the same pick in CNG with AC on, as one is getting on PETROL ???
Like there is a significant difference in PERFORMANCE when switching the AC ON in 1000 CC category.
Thats why I added
PERFORMANCE
in the title.
And one of my friends tolds me that there r certain plugs that will improve the performance as well.
Being an ametuer I created this forum to get the exact brand title that will ensure the performance and ECONOMY.
I m more interested to get better milage form these PLUGS and the addition of little performance ensures good RUN on Air Conditioner
. 
@all
Are these plugs safe for ENGINE ???
I mean do they harm the engine ???