I am on my 3rd Jeep Grand Cherokee with first one (1984) going to my ex with divorce. This one had the 360 V8 and didnt surpass the 10-12 MPG mark of highway driving. None of the Jeeps I have owned rode "like a log wagon" but had really smooth rides on highway, however the suspension is a bit harsh on rough roads. They dont compare to the CJ's in ride nor road noise. My 1995 GC Laredo that I bought in Canada had great off road stats and was pretty good mechanically till it developed a starting problem seemingly overnight. It took a good battery to get it started in the mornings or after setting all day at work. After initial start up, it would start easily as long as it didnt set for more that a couple of hours. Dealership couldn't fix it, even a new ECM didnt fix it. Finally sold it at auction for $2500.
I recently bought a 2005 Grand Cherokee Limited with 5.7L hemi engine from my neighbor that has never been off the highway with only 115,500 miles. He used it for towing behind his motorhome. It has custom mag wheels, upgraded LED light front and rear, leather interior and all in cherry condition. Even the engine bay is spotlessly clean. It is now the wife's car and best I can tell with only 1000 miles of driving, it gets 20 MPG. I love the growl it emits when starting and the engine power is phenomenal. I still prefer to drive my 2013 CRV since it handles more like a sports car than the Jeep and is actually easier for me to get in and out of than the Jeep.
My 2007 Chevy Silverado is mostly a garage queen unless I need to pull a trailer.