I can pull 20.5 combined 20% city 80% highway, hand calculated. I drive like Miss Daisy in town, 6 spd manual, keep the rpms below 2k and pretend I have an egg between my foot and the pedal, very frustrating for those around me no doubt.. On the highway, I keep speed at 65, never anymore than that. Go 70 or get a head wind and I get 18.5 hand calculated. I have run 70 on the highway and into 30mph headwinds and I have gotten 14 hand calculated. My ranches are an hour south and east of where I live so I get lots of road time to test conditions. Keep your tires aired up, keep the extra crap (weight) out of your vehicle, and drive slower is the best you can do driving a brick.
2014 JK Anvil Rubicon
If you eat, drink, or wear cloths then you're involved in agriculture.