At consistent speeds above 65 you are unlikely to see an FE above 40 MPG. The energy demand is simply too high.
A lot of variables enter into the FE -- some you can control, and others you cannot. The largest ones are where you live, the route and the type of driving you do.
The biggest one you can control is the discipline required to achieve a high FE. Choose repetitive routes with efficient speeds, learn the route and learn to anticipate small grade changes, stoplights (to hit them while green and without a traffic line-up left over from the red), stop signs, bottlenecks, etc. Learn to drive "ahead" of the car, and stick to the planned speeds.
You will need to learn to let the "A" types pass if you want to maximize FE. This does not mean that you must always crawl along a low speeds, but it does mean gradual and smooth accelerations and braking (when necessary, I try to avoid it with planning and often play a game with myselft to see if I can avoid brakes totally on my 32 mile commute.)
The oft mentioned "Pulse and Glide" used by hypermilers in the Prius does not work as well for the TCH. Instead, learn to carry a little extra speed into the top of a long coast and then "glide" either by accepting gradual speed losses while attempting to keep the MPG indication at 60 MPG above 40, or by gentle use of EV power if below 40 (actually the speed varies with the torque load, but that is an advanced subject).
Good luck in your quest to hit 40. It can be done --- routinely. My TCH has never had a tank average under 40 (although I have come close a few times in the Washington winter -- and I have lifetime fuel receipts to prove it.