Not getting the emissions fix?

I live in NJ and have a 2015 Golf Sportwagon SE MT TDI that is elegible for buy back or emissions fix. I love the car (except for the uncomfortable front seats) so I think I want to keep it but don't want the emissions fix to kill the mileage. What kind of MPG are people seeing that had the fix done? I was also thinking about not getting the fix done and keeping it as is. Anybody else doing this? Would I be able to pass inspection without the fix?
Thanks for your help

Not getting the emissions fix?