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i get high 21s to high 22s depending on how much traffic i sit in in Seattle this winter (30s-40s temp-wise). the best i've gotten was 29.8 in the fall on a 99% highway drive from Seattle to mid-Oregon.
1 weeks worth of Driving, 1 tank of gas. I average 28-29 mixed City/Highway 25/75%, and regularly squeeze ~480 Miles out of 1 tank of gas. I'm older now so I drive her with care and try to anticipate lights, use cruise control often and coast when possible. The car is a 2007 IS350 with a full JUN Exhaust and F-Sport Intake. 67K on the Clock, I love my baby.