So i've noticed lately that my mpg has dropped to 11.5mpg, does this sound unreasonable for a 318, 5 speed 4x4 with 33x11.2s? (285 75 16s). Id say this is 70 percent city 30 highway.

I swear before my tires I was getting 13,14 in the city 16 maybe 17 highway.
Seems like theres something going on. Not throwing any codes....

 

With a 5.2 and tires that big I'd say that sounds about right. Do you have a tuner because your mpg calculations will be off by a little if you don't have the ecu adjusted for the bigger tires