Mpg
Can't really tell if MPG will be better yet. I have too many things going on to isolate the Cat-back savings. I'm running the TRD air filter and I only have 1100 miles on it. I'm going to drop the oil soon and run Amsoil series 2000 from now on. I will be able to get a better idea once break-in is over.
I've only run a couple of tanks through it and getting 13.5 - 14 MPG. Almost all city driving. I'm hoping that number will go up a little as my mods kick in and the ECU gets a little smarter.
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