highway driving

I use the cruise control all the time along with ECO mode. I do disconnect it occasionally for a little hypermiling around hills.

Cruise speed makes all the difference when it comes to highway mpg's (or L/100km in your case). At 60 mph, you will see around 55-60 mpg (3.9L/100km at sea level on flat roads. Of course, going faster will yield less mpg (more L/100km). It all depends on your comfort factor.

 

I do the same as skwcrj generally.
One thing to note, just from my experience, I found what mode you are in does not make any difference on how Cruise Control behaves. If you start to climb a hill with CC on, even in ECO mode it will accelerate hard to maintain your speed. Maybe the dynamic CC is different(smarter?) but the standard CC seems to work the same as in any other car.
I notice though it does accelerate gently to get up to speed if you are trying to get up to speed going downhill, and it will even use regen to slow the car a bit on a steeper descent if you are going too fast.
That aside, ECO mode does make it easier to control the lead foot when cruising down the highway with CC off.

 

I just leave it in eco and use cruise above 35 mph. On a recent trip I cruised at 73 mph and got 43 mpg. Two in the car with light luggage.

 

Nice detailed observations.
Maybe not as detailed as yours but here are some observations from my last tank. I wasn't particularly driving for economy this last tank(stayed in normal mode the whole time, generous use of heater). I suspect my location is close to yours syscon, as the outide temperage has averaged about -5 the past week where i've been driving, so interesting to compare results.

filled up tonight:
537 km on the trip computer
6.1l/100km avg indicated
i calculated 6.5l/100km after 35 liter fill up

Most of my highway driving is on highway 16 west of edmonton so speed limit is 110 kph. Depending on my mood and if i've been in a hurry i say i've set cruise on 120 kph(sometimes sprinting to 140kph to pass gravel trucks) , when i wasn't in a hurry drove 100 kph. 1/3 of my commute to work involves a section of secondary highway with a speed limit of 80. I drive the speed limit on that portion of highway. So a real mix of cruising speeds on the highway but i try to stay out of the pwr zone if theres nobody behind me and try to maximize regen when coming to a stop, no abrupt changes of speed. I would say 20% of that tank was city driving.


Seems like cruising speed makes a big difference, so i'm going to try to keep my average speed down this next tank, keep it in eco mode. Have also started plugging in the block heater every night now if it gets below 0(set on timer to heat for 2 hours before i leave for work), neighbors might think i'm nuts, if anyone asks i just tell em i need to plug it in because it's an electric car.