I'm happy to report that today I did the following route https://goo.gl/maps/cPsKA in both directions, going east at around 2:30pm and coming back around 4:30pm, ambient was about 33 C, no substantial wind. I started with half tank of gas and 3.9 l / 100km avg consumption displayed by the computer, and ended with 3.8 l / 100km. Silly me I didn't pay attention to see what the consumption for the specific trip was, but conservatively I'd say to go from 3.9 to 3.8, the consumption was at least 3.7 l / 100 km. This is better for the exact same trip which I have done several times. Using a lot of CC I have gotten around 4.3 l/100 km, so optimized driving makes the difference between 63.5 mpg and 54.7 mpg. The driving technique: The most important thing: at high load keep the ICE running in the upper half of the ECO HSI (high ICE efficiency). Don't exceed 80kph, and when climbing reduce speed so the HSI stays in the high efficiency zone (I went as low as 40kph at some steep 10% uphill sections.) Instead of constant speed, manage the HSI needle so you are in the upper ECO area. At mid-load use P&G and forget about trying to truly glide (pain in the nice person), go ahead and use the electric motor a little. If a substantial downhill or uphill is coming up, go ahead and abuse the electric motor carefully managing the HSI needle so it stays under the midpoint of the HSI (the idea is, we will get the recharge either at optimum ICE efficiency or for free via regen.) When using electricity don't go over 75kph so we don't spin the ICE. Naturally my P&G usually go to 80kph, lift, dip to regen and by the time the go pedal is pressed the speed is <= 75kph so we can go on pure electricity. Considering how hilly this route is, I'm stocked. It definitely pays to be looking at the electric motor for help when the ICE will be running inefficiently!