My wife drives our 2013 Pilot daily, so I don't get many opportunities to look it over, but we did some highway driving over the weekend and it looks like she's been averaging around 17mpg, which feels low. We are in a big city with a fair bit of stop and go traffic and she probably has a heavier foot than I, but according to my math based on the 160 or so highway miles we drove this weekend, that's about what it's getting. After filling the tank and driving all highway, we burned about a 1/4 tank (5ish) gallons in 80 miles with me driving using cruise control. It has about 48K miles, and I run a bottle of chevron with techron fuel system cleaner through it when I think about it, which isn't often. Any ideas as to what may be causing lower mileage? Thanks.