How much does speed affect range?

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LongMynd
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Post by LongMynd »

So far overall we're getting 3.9 mi/kWh.
Improved to 4.4 mi/kWh when less than a quarter was on motorways.
I tend to drive (rather predictably) at 70 mph on UK motorways and 130 kph in France. I appreciate that if we drive more slowly the whole journey will take longer, but if it means fewer stops to charge might it actually get us to our destination earlier?

When comparing with an ICE vehicle I think that speed may increase consumption rather more. On the other hand a road with lots of roundabouts has very little effect on our EV whereas it considerably increased the consumption of our diesel.

What, please are others finding and have you any advice?
Does changing mode to ECO make any difference?
Charles.
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Kryten
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Post by Kryten »

I try to stick to 65mph on motorways, find it a happy medium. Tried eco setting and it didn't seem to make much difference?
LongMynd
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Post by LongMynd »

Thanks.
Charles.
ID.3 Tour with heat-pump
G43FAN

Post by G43FAN »

If you watch some of the videos Tesla Bjorn does you get some good information. He also publishes all his test info so for instance on a test with the ID3 Max 1st Edition it shows that the difference between 90 and 120 km/h is almost 50% more consumption.

VW ID3 1st Max 62 kWh Summer Dry 18 Bridgestone Turanza Eco Fr:215/45-20 Rr:215/45-20 Speed (km/h) 90 Wh/Km - 142
VW ID3 1st Max 62 kWh Summer Dry 18 Bridgestone Turanza Eco Fr:215/45-20 Rr:215/45-20 Speed (km/h) 120 Wh/Km - 210

Looking through the figures on his sheets, the ID.3 seems to drop efficiency much more noticeably as speed increases than other EVs.
OllyExeterID3
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Post by OllyExeterID3 »

G43FAN wrote: Tue Sep 21, 2021 2:36 pm If you watch some of the videos Tesla Bjorn does you get some good information. He also publishes all his test info so for instance on a test with the ID3 Max 1st Edition it shows that the difference between 90 and 120 km/h is almost 50% more consumption.

VW ID3 1st Max 62 kWh Summer Dry 18 Bridgestone Turanza Eco Fr:215/45-20 Rr:215/45-20 Speed (km/h) 90 Wh/Km - 142
VW ID3 1st Max 62 kWh Summer Dry 18 Bridgestone Turanza Eco Fr:215/45-20 Rr:215/45-20 Speed (km/h) 120 Wh/Km - 210

Looking through the figures on his sheets, the ID.3 seems to drop efficiency much more noticeably as speed increases than other EVs.
Agreed that Tesla Bjorn is a good source of info on this. From personal experience, I would agree the ID3 does drop efficiency more quickly the other EVs at higher speeds. I tend to stick to about 65mph left-hand lane driving on motorways and anything above this tends to cause a significant drop in efficiency. As a guide, we have been hitting 4.2 mi/kWh this whole summer, including 2 hours + journeys on dual carriageways at approx 65mph.

The summer mileage seems about what I was expecting (~ 245/250 miles at 100%) and I do tend to be a little less conservative with my driving than with our previous EV!
Deleted User 192

Post by Deleted User 192 »

I drive up to speed limits, do some route planning in advance to ensure a couple of charging options, and just stop to charge when I need to.

I can’t be bothered sticking at 65, or drafting a truck at 56…
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Daveion
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Post by Daveion »

Energy consumption increases to the square of the velocity (speed)
Taking all other things out of the energy equation.
Drag coefficient, gradient, weight, rolling resistance etc you can make a direct comparison of energy consumed simply by the velocity squared.
55mph. 55x55=3025
78mph. 78x78=6084
So travelling at 78mph will get through kWs twice as fast as travelling at 55mph.
That is why Motorway driving hits range.
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Utumno
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Post by Utumno »

Daveion wrote: Tue Sep 21, 2021 5:45 pm Energy consumption increases to the square of the velocity (speed)
Taking all other things out of the energy equation.
Drag coefficient, gradient, weight, rolling resistance etc you can make a direct comparison of energy consumed simply by the velocity squared.
55mph. 55x55=3025
78mph. 78x78=6084
So travelling at 78mph will get through kWs twice as fast as travelling at 55mph.
That is why Motorway driving hits range.

And in case anyone was thinking this is an EV thing, it's not. The same physics affects ICE cars (obviously...) with broadly similar results (a "miles per gallon" reduction, resulting in a .... decrease in range ;-) )
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Daveion
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Post by Daveion »

As Utumno says. Its the laws of physics. Not just EVs. It maybe less noticeable on an ICE because of relative consumption when warming up, short runs and engine optimum temperature not being reached, dpf cycle on diesels. These things dont come into play when cruising on a motirway when things are seemingly at their most efficient in an ICE. EVs have a battery warm up cycle below around 12-14C but beyond that they are more efficient than an ICE from the off.
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Post by colonelpurple »

Driving over 70 and rapid acceleration are the biggest drains on battery.
We drive in B mode all the time
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