The last couple of months my gas millage has gone down the drain. I was routinely getting 17+ mpg and suddenly my mpg has dropped down to 8. I live in the rocky mountains and work a mile away from home. Not an aggressive driver either. Recently changed the air filter and oil. Any ideas on what could be going on? Eco mode is on but doesn't seem to make a difference.

On a different note, my cadillac cue screen doesn't respond to touch on the lower half and my drivers seat doesn't heat up at all.

Not under warranty- car has 71k miles

2013 SRX