2001 Durango RT 5.9 Just installed airaid CAI and throttle body spacer...my mpg dropped from about 14-15 to about 8-9, and I been using a really light foot. Only thing I unplugged was 2 sensors on driver side of throttle body. I also unplugged the battery for a while to see if that would do anything.

 

I'd be surprised if the cai dropped the mpg that much, and the throttle body spacer is just a really expensive paperweight, it literally will do nothing performance wise. I'd double check the connections on the sensors and try resetting the pcm again.

 

And toss the TB spaces as far as you can throw them.......

 

I 2nd the spacer plate.