Bad gas mileage after 90 miles offroad use
I have a fairly new to me 01 WJ limited 4.7 quadratrac which gets about 22 miles per gallon on the freeway, completely stock except k&n air filter. On my way out to Searchlight Nevada I was getting about 22-24 miles per gallon on the 15, then drove 90 miles off road. The roads were rocky washes, with lots of vegetation in the middle of the roads. I did bottom out the shocks a few times in the washes. ON the way back home I was getting around 16-17 miles per gallon. Just to confirm I took it out again the next day, and the same terrible gas mileage. From what I've found in my manual, and online, it sounds like the emmision system is not working correctly, but it hasn't thrown any codes yet. I got under the Jeep and removed a bunch of dry vegetation around the gas tank, but couldn't find any disconnected hoses or anything apparently wrong. Cleaned the air filter, same results. Any ideas?