1. Slow down to close to, or better at, or even better below posted speed limits when traffic permits. Much of the time if you actually do go below the posted limit and in the Right lane most people won't care. Most will follow at a safe distance for miles then go around. A few might follow at a safe distance for a great many miles. Only a very tiny minority will tailgate for a short while then go around. It doesn't matter to them anyway...they'll just tailgate the next car.
2. Drive with the load. Let your speed sag going up hill, regain that speed again going downhill.
3. Keep momentum. Don't rush a red stop light (Drive w/o brakes), increase your traffic buffer when approaching a light so you won't catch it red.
4. Keep a traffic buffer. Keep a big distance between you and the car ahead, so when he stops/slows down (Like making a Left turn) you don't have to stop/slow down.
5. Watch the road as far as possible to anticipate both traffic and road grade.
6. Try alternate routes that favor fuel efficiency. For example if your commute takes you across heavy traffic and cursed with lots of lights then perhaps there is another way around that congestion. You will never know those better routes unless you take the time and actually look.
7. Memorize your commute route. Know where you can coast and where you need more gas. Learn exactly how much fuel is required over specific segments. Don't just "gas it" because you see a hill.
8. Sometimes the use of Assist is required, other times you can moderate it (Choose) if it comes on. With my car it is about the 40MPG range where it comes on. If you have a choice over a segment to use it or not, keep it off.
9. If you must use AC then activate the compressor only when going downhill or coasting. Never just allow it to run on its own. You'll be fighting all those uphills dragging a running AC compressor as well.
Same goes with Defrost. (Unless cycling won't keep the windows clear)
I bring a 6-pack size cooler with ice water and a dabbing cloth and don't use AC except for a few very brief moments.
10. If your car sits parked for hours then back it in, so when you return you don't have to back it out, put in D and go. This way when you return you can just put in D and go.
11. Be extra, extra careful FE wise in the first couple miles after start up. I don't know how long your commute is but my own car is pretty much warmed up after around 10-15 miles.
12. Increase tire pressure to what you consider a safe level. The higher the pressure the better the FE. Don't exceed maximum sidewall PSI while the tire is cold. (Not driven for an hour) I run mine at 51PSI max and if one tire drops to...about 40lbs I know it both by feel and FE.
The recommended 32PSI feels like wet sand to me.

Well I guess that's my top dozen.
None of those tips are fanatical or dangerous, but can substantially increase your efficiency.
Of course the more you apply them the better results you'll have.
Extraordinary results are possible only through extraordinary effort.

Efficient drivers do it better.
1003 miles a tank personal record. 74MPG calculated. HCH1 CVT