You guys are gonna hate me for this, but I consistently run very high 16's in the city and very high 18's on highway. My average highway speed is over 75. My average city speed is 40. I am not aggressively trying to take things slowly by any means, this is an actual average, actual driving, which for me is relatively rapid. I come close to 18.5 in the city with an extra light foot, with an extra heavy foot in the city, 12 - 14.