I can't comment on the eco mode (I have never used it) but your experience doesnt seem right unless you are in some extreme weather area where the temperature is so cold that the battery is being rapidly depleted.
I drive in warm to hot Phoenix area and I get anywhere from the listed miles (on the battery gauge) to about 25% less (extremely hot weather).
If you are not in extreme weather, and you are not tracking it, then you have a problem Houston and need to go to the dealer.
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