Mi/kWh

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JonB
Posts: 86
Joined: Sat Nov 10, 2018 11:59 pm
Location: London

Mi/kWh

Post by JonB » Sat Mar 09, 2019 4:41 pm

I know this is a range question by another name but I am curious about other people’s experience.
I have now driven the same 120 mile journey in both directions about half a dozen times in all in slightly different temperatures and road conditions. The route involves about 15 miles in London traffic and then motorway or dual carriageway and about 20 miles of single carriage A road. I don’t think I have an excessively heavy right foot and most of the time I am not testing the iPace’s terrific acceleration. My motorway cruising speed is between 70 and 75 or so and for the rest it is pretty much as the traffic and/or the speed limits and road conditions determine. (Too many points on the license to risk anything else). Car is in Comfort mode with high regen.
20 inch wheels by the way.
My best average mi/kWh for the journeys appears to be 2.5 and at worst it has dropped to 2.03.
Anyone else have their experiences to share?
PS: Jelle, if you read this, any chance you could do the math for me to translate your amazingly detailed spreadsheet for your long journey into an average mi/kWh stat for each way for those of us who are mathematically challenged?
Last edited by JonB on Sat Mar 09, 2019 5:03 pm, edited 1 time in total.


holderone
Posts: 89
Joined: Sun Feb 17, 2019 7:57 pm
Location: UK

Re: Mi/kWh

Post by holderone » Sat Mar 09, 2019 4:47 pm

best 2.52 and 2.2 for similar set up same distances. Avg temps 10C for best 2C for worst
Ipace 1st edition, Corris grey, 22 Inch Alloys


J2T2
Posts: 108
Joined: Thu Oct 04, 2018 11:37 am
Location: England

Re: Mi/kWh

Post by J2T2 » Sun Mar 10, 2019 6:16 pm

I seem to get around 2.5 to 3 miles per kWh on long journeys like you describe. Typically I’d get an average speed of 50 or so (M20/M25/M1, M4) allowing for roadworks etc.
Graph shows the variation.

Efficiency v journey length.pdf
(36.18 KiB) Downloaded 46 times



anorak
Posts: 106
Joined: Sun Feb 03, 2019 10:56 pm
Location: Cambs. UK

Re: Mi/kWh

Post by anorak » Sun Mar 10, 2019 7:22 pm

Chewy did some motorway runs and got the following figures at constant speeds...

35.6 kWh/100mi @ 65mph (2.8 miles/kWh)
30.0 kWh/100mi @ 55mph (3.3 miles/kWh)

Extrapolating and using Nissan's data for the LEAF's power consumption at increasing speeds (very similar percentage variations at 55 vs 65mph) gave 2.1 miles/kWh for the i-Pace at a constant 75mph.

Efficiency drops exponentially with speed in any vehicle (regardless of its power source) so if the majority of your trip is at 70-75mph I would say 2.0 - 2.5 miles/kWh is to be expected.

The LEAF only manages around 2.8 at those speeds. Drop down to 65-70mph on the motorway and I reckon your range will increase by 15 to 20%.

It feels slow though!


fellowsm
Posts: 7
Joined: Thu Feb 28, 2019 12:44 pm
Location: United Kingdom

Re: Mi/kWh

Post by fellowsm » Tue Mar 12, 2019 9:49 am

How do you achieve 30.0KWh/100ml ?

I'm driving fairly conservatively keeping around 55-60mph for my 10 mile up the M3 and usually <50mph on the 45 miles on the A32 best i ever see is 38-40Kwh/100ml

FE with 20inch wheels on low regen


Aus_ipace
Posts: 52
Joined: Fri May 18, 2018 5:36 am
Location: Melbourne, Australia

Re: Mi/kWh

Post by Aus_ipace » Tue Mar 12, 2019 11:36 am

Wait until your temps get to 18-25C and you'll easily achieve these rates.

I consistently get 19kWh per 100kms (equates to 3.3 miles per kWh) and the best so far is 17kWh /100km (3.7 miles). I have been experimenting with high and low regeneration, seat coolers vs climate control etc. Definitely climate control makes a big difference, not much difference with regen for my freeway run. Average speed is typically around 65km/h as our freeway speed limit is 100km/h.
Jaguar I-Pace FE Corris Grey. Built Sept 2018, delivered (finally) in Feb 2019.


Marv
Posts: 6
Joined: Sun Feb 03, 2019 3:55 pm
Location: London

Re: Mi/kWh

Post by Marv » Fri Mar 15, 2019 3:34 pm

Totally agree on that. I've had a PHEV (Audi A3 etron) for 4 years and the range is massively temperature dependent. It's both battery temp and having to run the heating (the Audi is worse than the I Pace for heating in the winter as it uses direct heating, not a heat pump). Audi will typically do 3.5 miles per kWh in the (British) summer and less than 2 miles per kWh in the depths of the winter. All that waste heat from an ICE is put to good use in the winter!
I-Pace First Edition Corris Grey


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