The front brakes on my 02 JGC are maintaining pressure. This is causing brake drag which causes very poor mileage and increased wear of brake parts. At worst, MPG was 5 just to maintain 25 MPH. Ceramic pads are installed. Regreased pins and all contact surfaces on calipers and bled system.
Anyone seen this problem?

How hard was it to compress the pistons?

Im thinking either the calipers are freezing, the flex line at the wheels internally collapsed, or something further up like ABS or master cyclinder.