I have heard of this engine in a 2wd 6 speed manual getting in the 20's as far as mpg???? I simply dont believe this in a 3/4 ton. I have two gassers a chevy 5.7 and a dodge 5.9....both avg from 8 loaded to 12 unloaded. I am driving 100+ miles a day so if this is true...even if less when trailering, It may make sense to look into this configuration????