DonDakin
Posts: 376
Joined: Wed Aug 15, 2012 7:10 pm

Imiev efficiency on the highway

Sun Jul 17, 2016 11:35 am

I recently watched this video

http://youtu.be/ubDItYYrtZ0

And i thought i would try this on the imiev for comparison sake.

I did 4 runs on a 7km mile stretch of the highway 2 at 80 km per hour and 2 at 110 km per hour. I did the runs in both direction to compensate for wind and elevation differences.

Results were 110/124 wh/km at 80 km per hour and 156/189 wh/km at 110 kph.
That gives an average of 117 wh/km at 80 kph and 172.5 wh/km at 110 kph.

So in the imiev driving at 110 kph vs 80 kph takes 47% more energy.

It was also interesting to note that at 80 km per hour the wind/elevation made a 13 % change vs at 111kph the difference was 21%.

Also interesting is that comparing with bjorns numbers for the leaf the imiev is 16 % more efficient at 80 kph and 13% more efficient at 110 kph.

I did this test with canion and included in the test is the acceleration from 65 kph on the freeway entrance on ramp. I mean i reset canion just as i was getting on the freeway.

Most of us already know this qualitatively but i thought it was nice to have some numbers.

One other interesting thing is the imiev speedo seems to be about 2.5 kmph slow compared to the gps. I guess mitsu did that to help out just a little bit more on the range of the car.

Don.....

mdbuilder
Posts: 227
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Location: Great Mills, Md.

Re: Imiev efficiency on the highway

Sun Jul 17, 2016 1:29 pm

80 kph is so damn slow :lol:
2015 Nissan NV200
2012 I-Miev SE Premium
2009 Mazda 5
2017 Toyota Prius Prime

Don
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Location: Biloxi MS

Re: Imiev efficiency on the highway

Sun Jul 17, 2016 2:11 pm

mdbuilder wrote:80 kph is so damn slow :lol:
That's 50 mph - I'm at that number or below for about 95% of my driving. Probably why I regularly see middle 80's on the RR gauge after a full recharge . . . . and I can actually go 80 miles on a charge most times :mrgreen:

Don
2012 iMiEV SE Premium, White
2012 iMiEV SE, White
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2014 Ford Transit Connect XLT SWB wagon, 14,000 miles
1979 Honda CBX six into six

wmcbrine
Posts: 363
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Location: Laurel, MD
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Re: Imiev efficiency on the highway

Sun Jul 17, 2016 3:30 pm

DonDakin wrote:One other interesting thing is the imiev speedo seems to be about 2.5 kmph slow compared to the gps.

Are you saying that it would read 80 on the speedometer, and 82.5 on the GPS? Or the other way around?

DonDakin
Posts: 376
Joined: Wed Aug 15, 2012 7:10 pm

Re: Imiev efficiency on the highway

Sun Jul 17, 2016 7:17 pm

80 on the speedo was 77-78 on the gps. In kph.

Don....

Don
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Re: Imiev efficiency on the highway

Sun Jul 17, 2016 7:26 pm

DonDakin wrote:80 on the speedo was 77-78 on the gps. In kph.
Most cars I've driven have speedo's that read a bit higher than the actual speed. I think the manufacturers do that on purpose. It does reduce the likelihood of you getting a speeding ticket

Don
2012 iMiEV SE Premium, White
2012 iMiEV SE, White
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2014 Ford Transit Connect XLT SWB wagon, 14,000 miles
1979 Honda CBX six into six

PV1
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Re: Imiev efficiency on the highway

Sun Jul 17, 2016 8:00 pm

Both of my cars are the opposite. Roadside radar signs and GPS register 1 MPH higher than the dash speedometer...except when I had the 175/55R15 tires on the back, then it was 3 MPH higher than actual (but no regen).
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JoeS
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Re: Imiev efficiency on the highway

Sun Jul 17, 2016 11:31 pm

DonDakin wrote:...Most of us already know this qualitatively but i thought it was nice to have some numbers...
DonDakin, thanks for posting. In the same vein, if anyone is interested in seeing the theoretical curves of range vs. speed, here's the link:
http://myimiev.com/forum/viewtopic.php?p=17565#p17565
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mdbuilder
Posts: 227
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Location: Great Mills, Md.

Re: Imiev efficiency on the highway

Mon Jul 18, 2016 3:48 am

Don wrote:
mdbuilder wrote:80 kph is so damn slow :lol:
That's 50 mph - I'm at that number or below for about 95% of my driving. Probably why I regularly see middle 80's on the RR gauge after a full recharge . . . . and I can actually go 80 miles on a charge most times :mrgreen:

Don


Last night after a few trips over the weekend I was down to 15 miles on the RR with the A/C on. I washed it and decided to blow off the water on the local loop past the Starbucks which is appr. 12 or 13 miles.

First 5 or so miles a/c on, 45-50 following traffic. At the turn I was getting slightly concerned so I killed the a/c and continued at normal if somewhat slow speed to Starbucks. Leaving there with 10 miles on the meter and 7 miles to go I did the first couple down the highway at 45 max, no traffic ahead. Then I got behind two trucks loaded with pavement for the nights work. Followed them for almost 3 miles at 25-30, followed by a slight and short climb at 40mph and the downhill glide to my house for the last .75 miles.

This morning there is 86 miles on my RR meter. 11 miles more than the previous high and 19 miles more than my most common normal reading. If I had to drive like that all the time I might need to shoot myself :shock:
2015 Nissan NV200
2012 I-Miev SE Premium
2009 Mazda 5
2017 Toyota Prius Prime

Don
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Re: Imiev efficiency on the highway

Mon Jul 18, 2016 9:39 am

I guess it depends on where you live and where you drive

We live in the country on a 40 mph road and other than a very brief stint on the freeway to get across the bay (4 miles) our car never sees a road with a speed limit above 45, so going slowly, getting a great range is as simple as just flowing with the traffic - We're no slower than anyone else and we're definitely not holding up traffic. IMO, this is the sort of use the car was designed for - They would have given it a much better co-efficient of drag if they thought it was going to be used as anything other than an urban commuter car

If we needed a freeway car, we'd own a Tesla!

Don
2012 iMiEV SE Premium, White
2012 iMiEV SE, White
2017 Chevy Volt Premier
2014 Ford Transit Connect XLT SWB wagon, 14,000 miles
1979 Honda CBX six into six

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