I guess it;s what you are used to.
My previous 4x4's have been 4.2 TD Landcruiser (80), 95 4.0 High Output Cherokee and 2 Ford explorers, 1 4.0 v6 and 1 5.7 V8 (RHD converted).
Both fords managed a consistent 22mpg, 17 off road and with 3ton on the back.
Cherokee managed 27 on a run but 25...