Randy993
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Leaf Number: 413398

What's a good average for the miles per kw/hr

Fri Jan 20, 2017 4:33 pm

I'm new to my leaf and have driven it several hundred miles. The miles per kw/hr goes between 4.5 and 4.6 per the gage on the car. Does anyone even use this reading and Is this something that can truly reflect your efficiency?
Thanks in advance,
Randy

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paulgipe
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Re: What's a good average for the miles per kw/hr

Fri Jan 20, 2017 6:12 pm

It's a useful measure to track your drivng style on level terrain.
Bakersfield, California
2015 Nissan S with QC, Brilliant Silver, leased
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cwerdna
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Re: What's a good average for the miles per kw/hr

Fri Jan 20, 2017 6:14 pm

The proper units are miles per kWh or miles/kWh. "kw/hr" makes no sense.

If you need an explanation, there are plenty if you Google for why not kilowatts per hour.

'13 blue Leaf SV w/premium package (owned)
'13 blue Leaf SV w/QC + LED & premium packages (lease over, car returned)
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IssacZachary
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Re: What's a good average for the miles per kw/hr

Fri Jan 20, 2017 7:42 pm

cwerdna wrote:The proper units are miles per kWh or miles/kWh. "kw/hr" makes no sense.

If you need an explanation, there are plenty if you Google for why not kilowatts per hour.


It made sense to me. :D

Anyhow, back to the point.


Miles per kWh is like the miles per gallon. You know that the Leaf has either a 24 kWh battery or a 30 kWh battery, depending on the year and options. So theoretically, if you have a 24 kWh battery and you get 4.5 miles per kWh average over the course of a trip, then you know that with a full battery you'll get 4.5 x 24 = 108 miles. However, you must take into account that a 24 kWh isn't going to give you a full 24 kWh. It's more like 21 kWh and less as it degrades with age. So 4.5 x 21 kWh = 94.5 miles. So the farther you keep it up high the farther you'll go.

It's obviously a reflection of how you're using energy. The more efficiently you drive the higher the number you'll get. Just like the miles per gallon in an ICE vehicle.
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jjeff
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Re: What's a good average for the miles per kw/hr

Fri Jan 20, 2017 8:32 pm

Even the auto mags(R&T for sure) now use miles/kwh on ICE vehicles for vehicle efficiencies, along with MPG.
2012 SL purchased used 2/'16
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jjeff
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Re: What's a good average for the miles per kw/hr

Sat Jan 21, 2017 6:48 am

jjeff wrote:Even the auto mags(R&T for sure) now use miles/kwh on ICE vehicles for vehicle efficiencies, along with MPG.

A couple of corrections, the mag was MT(Motor Trend) and the value the were using for both EV and ICE vehicles was kWh/100 miles.
Interesting to me was the readings for ICE vehicles, a Jeep Grand Cherokee showed a pitiful 241kW hrs/100 miles city and 153 kW hrs/100 miles hwy :shock: that would mean for this particular Jeep one would need to lug around a 241kWh battery to just go 100 city miles :shock:
They also reviewed a small Buick SUV(the one made in China) that got a woeful 153 kWh/100 miles city and 116kWh/100 miles hwy, still pitiful IMO to need a 153kWh battery to go 100 city miles or 116kWh battery to just go 100 miles hwy. :( I had no idea ICE vehicles were so pitiful in comparison to basically all EVs. For example they also reviewed the new Bolt and compared it to the Tesla S, the Bolt had a reading of 26 city and 31 hwy kWh/100 miles and the Tesla S 35 city 34 hwy kWh/100 miles which is more like it.

So if I'm doing my math correct, I had a ~2 year reading on my Leaf of 3.5 miles/kWh. Converting that to the new kWh/100 miles I believe it would be ~28.6 kWh/100 miles, not quite as good as the Bolt is supposed to be but better than the Tesla, about what I'd have thought and I'm actually pretty happy. Now others seem to report readings of 4-5 miles/kWh which would be 25-20 kWh/100 miles, now thats impressive 8-)
I reset my kWh meter this fall and in the middle of this bitter cold winter I'm getting a reading of 2.5-2.7 miles/kWh which would be more like 40-37 kWh/100 miles, not great but still beats the hell out of an ICE vehicle, one that I might be getting <20MPG in the same conditions. I guess to be fair my wife gets ~30 MPG with her basically all gas powered Prius in similar conditions, the Leaf still trumps it!
Last edited by jjeff on Sat Jan 21, 2017 7:03 am, edited 1 time in total.
2012 SL purchased used 2/'16
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'12 EVSEupgrade'd 20a L1/L2 EVSE, '13 EVSEupgrade'd adjustable 6-20a L2, 6-13a L1 EVSE
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DNAinaGoodWay
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Re: What's a good average for the miles per kw/hr

Sat Jan 21, 2017 7:01 am

4 m/kWh is a decent average. You're doing fine. It'll vary with terrain, speed, and ambient temperature/heater use.
'12 SL last reading @ 2 yr, 22k, 260 GIDs, 62.35 Ahr

'15 SV w/QC, Mfd 5/14, Leased 8/14, 292 GIDs, 64.38 Ahr when new

@ 25 months, 25k, 267 GID, 56.88 AHr
@ 36 months, 34k, 270 GID, 57.49 AHr


6.72 kW Array

jamesh
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Re: What's a good average for the miles per kw/hr

Fri Jan 27, 2017 9:06 pm

Most of the year, I challenge myself to average 4.0 mp kw/hr. This is not easy to do as I live in the foothills. With proper tire pressure (makes a huge difference), I can pull into work at up to 6.2 mp kw/hr (mostly downhill and flat), but on the way home, at 63mph, I usually end up with a round trip of 3.8 to 4.0. IF I am in no hurry, I can take the back roads (that basically run along the highway) and end up with 4.2 for a round trip.
Note that with the same driving, I am down to 3.5 to 3.8 in the winter. :|
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LeftieBiker
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Re: What's a good average for the miles per kw/hr

Fri Jan 27, 2017 9:45 pm

I'm at 3.3-3.5 in Winter, and 4.0-4.3 in Summer, usually about 4.2. I no longer use LRR tires. Don't obsess over the number though - it's only useful if your range is an issue.
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cwerdna
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Re: What's a good average for the miles per kw/hr

Sat Jan 28, 2017 1:24 am

jamesh wrote:Most of the year, I challenge myself to average 4.0 mp kw/hr.

These are the incorrect units. See viewtopic.php?p=482290#p482290.

'13 blue Leaf SV w/premium package (owned)
'13 blue Leaf SV w/QC + LED & premium packages (lease over, car returned)
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