84 mpg with cruise control

The drop on your route is 370 meters! My drop is 103 meters. I'll soon do the route in reverse.

 

Today I did the same route, but this time in both directions, however, it was unusually cooler at around 25 C.
At the end the car displayed 3.5 l/100 km or 67 mpg. It was mostly done via CC.

I learned some new things:

When the SOC is high, the car can go pure electric up to 87 kph.
When the SOC is average, the car will go pure electric up to 77 kph.
When the SOC is low, the car may kick out of electric even at low loads around 67 kph.

When the car is fully warmed up, the car can go most consistently on pure electric up to 77 kph, so setting the CC at exactly 77 kph may be advantageous. This is what I did for most of the trip. Although I experimented going 90 kph at some sections and the average consumption did not go up. Tomorrow I'll experiment doing the round trip at 90 kph to see what kind of consumption I get.

 

I just did the same route again, but it was a cool 21C going (8am) and 24C going back (9:30am). I just set the CC to 80 kph. Just prior to leaving in the morning I set the tires to 42psi front and 40psi rear. Result:

3.5 l/100km or 67 mpg.

On the highway I seem to get 67 mpg consistently without any effort on my part so long I stick to 80kph. I really don't see the point going 90kph, you don't gain much.

 

Yes! I have yet to determine the accuracy of the FE indicator, but I did remember to zero the 'A' trip odo after my last fill-up so I can go fill up at any time and see how many liters it takes in.

 

One important detail I forgot to mention is that our gas here is 100% pure gasoline. It better be, for $8/gal lol.

 

Today I did highway driving at 100 kph with CC! I never disengaged it. I noticed when the HSI shows a medium to low load (needle at or below slightly above the mid-level) the instantaneous consumption is some insane number, 1.x or 2.x l / 100 km. That's pure ICE, no indicated electric assist (unless the display lies.) I'm starting to reconsider the wisdom of always going no faster than 80 kph. My FE did not get any worse! LOL

 

I finally calculated my fuel efficiency. I did 697.8 km using 29.67 l which comes to 4.25 l/100 km vs an indicated 4.0 l/100 km. So the computer is around 6% optimistic. Note that several factors have contributed to the worse FE number for this tank.

1. It has gotten a lot cooler, gone are the 40c days, we are now in the 20s.
2. I decided to increase my highway cruising from 80 to 100 kph.
3. I no longer do anything special on the highway, I set the CC to 100 kph and let car sort things out.
4. I've been doing lots of short (<6km) trips.

Considering the above 55 mpg is not bad.

 

By the way, to get these great numbers I noticed the car must be fully warmed up. It takes around 10-15 mins.

 

I have given up on 80kph, I usually drive at 90 or 100 kph on the highway now. Instead of 3.5 l / 100 km I get 3.7 to 4.0 depending on temperature. It takes roughly 50 seconds for the first stage warmup, and about 10 km of 80 kph driving to be fully warmed up to the point it goes into SHM on the highway.

 

60 on 60 is pretty accurate. Right now with the temps in the low 20s C here it may be achievable on the highway when fully warmed up. However, including the many short trips I take and the 6% indicated FE optimism I'm getting actual 54 mpg.