I did a 408 km's today and was in Eco mode on the way up 204 km's and Normal on the way back 204 kms.
I set the cruise at 120 km's on the Hwy and 10 km's over the speed limit on the back roads. Overall trip up in eco was 20.3 mpg or 11.5 L/100 km.
On the way back same roads and normal setting same speed I got 11.1 L/100 km or 21.1 mpg.
At 120 km's the hybrid seems to use 11.5 L/100 km's with no wind and on flat ground. Electric only does not engage fully until you slow down or are going downhill by what I can see, Though the display does show that the Hybrid is helping to drive the wheels even when the engine is on. Just not fully electric like in the city or speeds below 80 km's per hour seems to be the electric only speeds.
I have not seen it electric only on the highway.
My first partial tank on my Platinum FX4 SCrew 5.5:
Total Miles: 232.9
Electric Miles: 44.7 (19.19% of total miles)
Cluster Indicated MPG: 17.7
Actual Measured MPG: 18.8 (12.39 Gallons)
This is the first vehicle I've owned where the cluster underreported MPG. 18.8 in comparison to my 2018 F150 FX4 Ecoboost 3.5L SCrew 5.5 is about 4.3 MPG better, given I've been driving about the same conditions since purchase. I'm pretty happy with that for the first partial tank since my truck is fully loaded as well. I think as it breaks in and I learn how to better maximize the hybrid system at slower speeds, MPG will improve.
So I’ve been hand calculating last 3 fill ups. Sometimes it’s only 1/4-1/2 down before I fill.
All three hand calculations are minimum 10% lower than computer says. Had Truck for 1300 miles but something feels goofy about computer numbers .
time will tell.
I'm not even going to worry about what it is until spring and then I'm not sure I'll really mess with calculating. It is what it is and when I need to fill up, I will. The L-O-M is right in front of my face when I shut it down anyway.... And, as a rule they are really optimistic so it will be less than I see.