Forum Discussion
4x4ord
Jun 04, 2016Explorer III
The Ford owners manual gives an indication as to the number of miles you can expect to go before adding DEF and says you can go much further between fill ups with the 3.31 gear ratios than with the 3.55. (I wonder if they don't program the 3.31 for better milage and the 3.55 more for towing because the bigger tires that come with the 3.55 almost offset the gear ratio) The DEF usage parallels fuel usage. From talking to many Ford owners it appears the 3.31 gears do, for whatever reason, provide much better fuel economy. The Platinum trim level only has the 3.55 gears available. I get about 15.5 mpg highway with my Platinum. Had I known the fuel economy was going to be this much worse than my 2011 I certainly wouldn't have bought 3.55 gears.
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