its intersting this came up i was just checking mine last week in the dump. 40 mile round trip hauling stone. 3.5 tons in box mpg one day was high sixes and the next day just under 3.5 tons was low sevens. no flat road so to speak of all down hill empty and all up hill loaded. when i used to check it some time ago it would get high sevens to low eights empty.
the ashton gets low sevens to high eights tare wt 11000. lbs no water
the dump 7300 lbs empty
the 40 gets 13.5 on a all out flat run for 650 miles to south bend and back
4400 lbs. empty
I average about 17 mpg with my 1950 6400
On a trip from Denver to my home in Montana (650 miles) with about 5000 lbs. on I averaged 17.6 mpg.
But the 235 is not stock
i dont believe that for a second. recheck your math.
