Anyone having any issues with the mileage ? I just bought a 2007 Tucson 4wd 2.7L and started with around 13 mpg. I just drove from new York to Chicago round trip plus some side trips and it went up to 18 mpg. Total mileage 2500. 2000 of which is interstate highways. I'm home 1 day now and driving around town it's already down to 17.9. I called the dealer and I'll be bringing it in this week, but the salesman started with the " break-in period" . When I questioned how long till I see the rated 28 or so highway, he didn't know. Thanks