I'm second to Bob on this thread.
There was a discussion at PriusChat...
http://priuschat.com/index.php?showtopic=19543&st=120
I believe nbalthaser@Greenhybrid is same as nielb@PriusChat.
Quote:
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Originally Posted by bwilson4web
But you raise an interesting question, how do we evaluate the ICE-to-wheel efficiency of other vehicles?
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FYI...
Following is my collected data of NHW-20 Prius driving highway with CC set at 91km/h(actual was 85 km/h).
Code:
section km mileage alt change
28km 24.5km/L 127m
15km 18.7km/L 248m
62km 40.8km/L -663m
Saw such various mileage results even on constant speed.
The reason was the altitude change on each sections.
If we use 0.106L/100m fuel to cover the potential energy, the table becomes as follows;
Code:
section km fuel used fuel pot fuel adj mileage
28km 1.14L -0.13L 1.01L 27.8km/L
15km 0.80L -0.26L 0.54L 27.8km/L
62km 1.52L 0.70L 2.22L 27.9km/L
Now, we can see constant about 27.8km/L mileage number for a virtual flat road.
The 0.106L/100m means...
34.6MJ/L * 0.106L = 3.67MJ consumed.
The mgh = 1350kg * 9.8 * 100m / 1000000 = 1.32MJ potential energy.
The tank to wheel efficiency is (1.32/3.67)*100=36.1%
We have following data on another vehicle...
1300kg NHW-11 Prius consumes 0.125L/100m ... 29.5%
900kg Honda Insight MT5 consumes 0.0823L/100m ... 30.9%
Ken@Japan