2011 5.7 limited with 66k miles. Got an oil chg and tire rotation yesterday before holiday road trip. I'm now about 100 miles into the trip getting 14 mpg highway and seems a little down on power. MDS only engaging rarely, downhill slopes. It's not running rough or feeling like there's an ignition issue. Only thing a little weird is its running a little cooler than normal -- 200 degrees -- but it's cold out, 16 degrees. Jiffy Lube replaced air filter, topped off coolant but no other issues. Other vitals -- oil temp 192 at 49 psi, trans temp 114. No warning lights, cannot check for codes since nothing is open today. Checked to make sure air filter housing was properly seated, looked for loose sensors but would guess that would have thrown a code already.
Baffled. Need some help here, know it's not much to go on...
2013 Jeep Grand Cherokee Overland
5.7L V8, 2WD,
AFE Dry drop in air filter, Quadratec mats, Sprint Booster, and Blastinbob's catback
Build date: 9/4/12
Bought 01/27/15 with 47,200 miles