Good post, cetane.
We have been doing what you describe for years, but with the recent price increases for fuel we've been a bit more diligent in application, and it does reduce your fuel costs. Each particular thing doesn't make a huge difference (well actually, driving gently does for some people
), but doing all of these can really add up to significant savings.
A couple of things I'd like to add.
Anticipate traffic movement - if the vehicles ahead are stopping or slowing down or you know that traffic light is going to change to red; back off the accelerator pedal and coast to the stoppage (many modern engines use no fuel at all while decelerating, the momentum of the vehicle keeps the engine turning over).
If you have a trip computer that will show instantaneous fuel usage, monitor that and try to keep the figure lower.
For most people using cruise control will help (good drivers can do better, but it takes a lot of cencentration).
Choose your trip times for when traffic is flowing more freely. This can be difficult, but sometimes you have a choice. I drive to Sydney from Canberra fairly often, and I try to time my arrival in Sydney for outside of peak traffic times.
Keep your tyre pressures up near the maximum (but check for excessive wear in the centre of the tread, in which case you may need to reduce it slightly).
Remove any excess weight from your vehicles - all those extra kilograms take fuel to lug up the hill, more than you gain from from coasting down the other side.
As an a side benefit, if you drive gently nearly all the time then when you do put your foot down hard your engine will feel more powerful 
IMHO if you are driving on a busy highway it is unsafe to drive too slowly (say less than 20 Kmhr slower than prevailing cruising speeds). Drivers coming up behind are just not expecting you to be travelling so slowly, and because so many are on cruise control and not paying attention they are likely to rearend you before they wake up enough to -
A realize there is a problem, and
B do something useful about it.
I've tried driving at 80Km/hr in fairly light traffic on a dual lane freeway, and while the improvement in fuel economy is large, it is just too dangerous (even if it is legal)
2017 MY18 Golf R 7.5 Wolfsburg wagon (boring white) delivered 21 Sep 2017, 2008 Octavia vRS wagon 2.0 TFSI 6M (bright yellow), 2006 T5 Transporter van 2.5 TDI 6M (gone but not forgotten).
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