I just got back from a trip to NYC in serious monsoon conditions. I was seriously worried about a wet airfilter with the rain just dumping on us, and traffic splashing up waves of stuff right up over the hood. Went there and back mostly in 4 wheel full-time, pretty slow going down, hitting 50 mph headwinds...and burning rubber coming back mostly 70+. Hit the 300 mile mark getting in the driveway and its just a tad below 1/2 tank. That's just plain psycho good mileage. Can't wait to re-fill and calculate. Don't know if it is still winter diesel but it is nice that diesel is cheaper than gas.
Forded 1.5 foot water on the "closed" flooded west-side highway. Since this baby-pram hasn't gotten much mud time, does that count as "off-roading"?
now, to got get the water out of the basement....

I would say so. Extreme conditions. You did get a wet filter from it most likely. Might want to check it out. That is some great mileage. It sucks out here because diesel is usually 30 cents higher than gas. Right now, it is 22 cents higher.