The last few weeks my fuel economy has dropped from 14 MPG City not towing to 12 MPG and from 12 MPG Highway towing my 8k trailer to 9 MPG. It's runs fine no change in performance and I have not changed my driving or the type of fuel I use. The fuel filter was replaced about 4 K ago.

Any thoughts?

Tomorrow I plan on cleaning my K&N air filter and MAF sensor although it was done 4K ago.

Truck info 03 LB7, 70K, straight pipe exhaust, K&N fresh air intake, NO tuner/chip. Hummer wheels w/315 70 17's
:help:

Tire pressure?

I wish it was that EZ but it's not tire pressure