Your mileage will drop like a rock. My driving is mostly local and average in the low 20's. We did take ours on a road trip from Wisconsin to Estes Park Co last year with 4 people, luggage stuffed everywhere we could, and a hitch mounted carrier for supplies behind the vehicle. We averaged 23 mpg across Iowa and Nebraska pushing 75 to 80 MPH where we could. My 2017 Chevy Colorado with the redesigned 3.6 and 8 speed trans. gets a little better. I had a 2014 Equinox with the 2.4 and that did get a couple of MPG better than I am now, but with the problems that engine has and no power on hills, I love my 3.6 engines. I would rather pay more for gas and be happy with the performance rather than listen to a high revving 4 cyl. trying to carry itself up hilly grades. There are a few here that must have a lot lighter foot than me as they seem to get better MPG than I do. I have not driven the new Equinox with Turbos to see how they compare. I know that they are smaller and I will not be able to cram as much in them as I can my current SUV. I am keeping my eyes open for the new Blazer coming out next year with the 3.6 that would be more comparable to my current Equinox.
In regards to the seats, my rear end gets sore after about 2 to 2 1/2 hours of driving. My seats are heated so the foam composition might be different when compared to non-heated seats.
2016 Equinox LT AWD - 3.6L LFX V-6 - Patriot Blue / DOB: 1/26/2016<br />2017 Colorado LT 4X4 - 3.6L LGZ V-6 - Silver Ice Metallic / DOB: 01/05/2017