Thats about what you should get, Highways speed of 75+ are not what EPA test at, more like 60 if you went 60 you would see 34+mpg, Also city 25-26 isnt bad at all for mixed driving its onlly supposed to get 26 EPA rates at 26/34 and I get well above both, Also gas millage isnt gaurunteed and it says on the tag it ranges from 16-30 in city and 23-48 highway. The dealer cnat do much for you its not like older cars where emmission need be ajusted or anything.