Cos my gf place at rasah, and i randomly visited few petronas at rasah jaya and S2/S3 all served 97... here in jb even some petronas located besides main road dun have 97 not to mention residential area... sigh...

Ron97 only....V-power sometimes but there's only 1 (one) Shell station in the whole of Seremban that offer V-power...very troublesome so don't use it much....
the only V-power station in Seremban is at Senawang Shell Station near Senawang toll there, if I not mistaken
. Yes, I think my car also have a bit of knocking sound when my car is on a full halt at traffic light sometimes. I think that is what u guys mean by knocking gua. 
