95 XJ on 33’s with 4.0, AW4 and half a ton of accessories including winch, roof rack, tire carrier etc. 4.56 gears and calibrated speedo.
I average combined 13 mpg. I use an mpguino touch screen fuel economy meter on my OBD1 Jeep that gives me distance to empty, instant fuel use and average. It’s proved to be 99% accurate.