My 6000LB 2000 Chevy Silverado 4x4 with an iron-block 6.0L LQ4 gets that they way I drive it. Granted it does have the more relaxed gearing and I drive it like old people f...hmm, eat icecream.
I don't think this is an Easter egg, jut a shot of gauges. This truck should be at least at 20MPG.