Poor fuel milage on 2006 Toyota Tacoma

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.

Asked by for the 2006 Toyota Tacoma
That is about right according to EPA mpg estimate!!
1 more answer
if over 75k miles i would get a tune up or start changing fuel filter first, rotate and balance your tires