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sub 17 mpg for 4.10 gears is in the normal range for a 2wdr on winter diesel.
some get better some worse
with the cold winter temps at your location, the local fuel depots are probably dumping 50% #1 mix into the diesel. the stuff has far less energy and mpg

original tranny?
how many miles on it?
get a scan tool or scanner on it and check for transmission slippage.
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