27.6 mpg on the highway. Trip back to DC from the CT beach via the NJ Turnpike. Display said 28.8 mpg but I’m going with the trip miles of 276 / 10 gallon fill-up. Trip up was 27 mpg - slightly lower due to some stop & go on the GW Bridge.
Here are my details: 1958 with stock tires, no roof rack, 67 mph on cruise control, eco mode, premium gas, trip was completely flat. 1,200 miles on the vehicle.
My takeaway is that the EPA rated 27 mpg highway listed on the dealer sticker is pretty much spot on. Of course higher speeds, AT tires, roof racks, hilly terrain etc. will noticeably reduce your actual mpg.