G_P

Ok To get this started I ran over a large branch that fell in front of me during a windstorm that knocked the tailpipe out of my muffler. I easily reconnected it and did the 02 sensor at the same time since my fuel mileage was getting a little bad. Also I installed a dual 12" sub box that I had laying around collecting dust that weighs around 80lbs. ( made of 3/4 MDF and built to last)

Lately after fixing all this my fuel mileage has gone to ****. I cant see adding the weight of the sub box as the problem but I'm gonna cut it in half and only run one sub as I really dont like that much bass anymore. (anyone wanna buy a 12" DVC Alpine type R??)

Oil has been changed and plugs looked mint (new plugs about 5k miles ago along with fuel filter, cap, rotor and wires) New alternator and battery about 1k miles ago. Belt is tensioned properly.

I'm lost here......