HI

Recently I got a Word from one of the Experts who said "that for any new petrol engine Car we shouldn't be stepping the gas more than 60KMPH for good FE"

My questions are

1) is the above statement true

2) in addition out of curiosity I drove the Car to check the TOP speed today , I drove @ 140-160KMPH for about 3-5 mins in Highway will this affect the FE though this is the first time I have done.

3) I found some weird noise when I passed the speed between 120-140 KMPH is this the same with all CARS

i need some valuable suggestions on the above comments

thanks

Ritz Ravikumar