We take our 08 3.0si up to the White Mountains, about a 170mile trip through Boston so there is some traffic. After some breakin we were getting 22-23mpg on the roundtrip. Speeds run from city traffic for 30 or so miles to 75+/- on the interstate to 45 on the last 30 miles. For local suburban driving we are getting 17-18. We are not doing much of that since we got a Mini for local.