I mostly do city driving and don't excessively speed or race or anything. I use the fuel treatment / fuel injector cleaner stuff everytime I change my oil and on occaision in between. Would changing my plug wires give me better efficiency or not? And also would my O2 sensors be functioning fine if there was no CEL or should I possibly look into that? One more question my car just started making the infamous rotten egg smell, the catalytic converter is the cause of the smell if I am correct and could cause this, poor fuel efficiency, also right? I am just curious because I am getting an SVT exhaust soon, my car has 55000 miles on it.
Thanks for all the replies.
