Poor fuel milage on 2006 Toyota Tacoma

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My Tacoma has gotten crummy gas milage since brand new; (18mpg Hwy - 15mpg city. I am a very conservative driver, not a "lead foot" Is this to be expected?
V6, 6 speed trailering, no mountains.
(2) Answers
That is about right according to EPA mpg estimate!!
if over 75k miles i would get a tune up or start changing fuel filter first, rotate and balance your tires