sorry for late reply, i returned the rims and Installed my own back, well theres one thing, i dont know if thats up with other 17s also, i never used CNG, i am always on petrol. and with those 17s, dude my petrol average was like, killed.... from shoba to hayatabad, 15kms. and it ate 3 dots normal traffic. car was felt heavier very heavy. and thats all. i think we should stick to the rims size company recommends