1) Remember to enjoy the car, and don't worry about how you're driving. Keep mileage in perspective:
You've just spent about $30,000 on the car.
35 MPG = 2.9 gal/100 mi = $10 (roughly, at $3.50 per gallon)
40 MPG = 2.5 gal/100 mi = $9
45 MPG = 2.2 gal/100 mi = $8
50 MPG = 2.0 gal/100 mi = $7
So each 5 MPG increment would save you what -- $100 to $200 per year -- in gas expense? "Involved" driving is a hobby, not a moral imperative.
2) The first month or so, the car is adjusting to you. Efficiency will improve on its own.
3) But if you want to take an active role, as noted above the biggest thing you can do is to note the brake score and see if you can ease it into the 90's. (If the brake score isn't showing on the left hand display every time you come to a stop, it can be turned on). Looking ahead and gentle braking saves miles into the battery. Hard braking throws away miles. My wife was worried about "riding the brakes" producing too much wear on the brake pads - in a hybrid, gentle braking doesn't use the brake pads.
3) A first approximation to the rest of the driving advice:
- Select the empower display in the left hand console display. Only look at the left hand arc.
- When the line is white (internal combustion is on), the ideal is to accelerate briskly at roughly the second crossbar.
- When you're up to speed and the white line drops down toward the bottom, briefly let off the accelerator and let the engine will drop into EV (blue) if it chooses to.
More advanced driving can follow on after these are habits. Also, braking hard when you have to won't kill your mileage for the entire tank. Accelerating into the yellow can be fun, and done occasionally you won't notice it in your MPG.
We're heading into winter, and your car is far from broken in, so don't get into a competition with the 60MPG'ers just yet. Wait till spring for that.
Again, enjoy the car, and only chase mileage if it's fun for you.