Mixed 75mph highway and rocky to deep sand trail gave me 11.1mpg for the first tank I calc'd.
Nick wants to get more Scanner data and have another prom or two burnt to see if he can dial up more fuel pressure to better atomize things.
I will keep updating mpg numbers tank by tank, I am a slow driver by nature and these things are bricks so I will be happy even if 12mpg is by best as it runs so well.
Glad your dad made it home from a terrible war. And I can understand why he feels the way he does, but maybe day trips and cabin stays would get him on the trail