Motorway speed power consumption

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Deleted User 192

Post by Deleted User 192 »

colonelpurple wrote: Wed Jul 07, 2021 6:49 am I didn't mean do 50 on a motorway, I just meant in general the most efficient speed

Did you consider this when driving an ICE car? Why worry about it now you have an EV?

(not being obtuse, I'm genuinely interested in your thought process)

MotMot
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Post by MotMot »

G43FAN wrote: Wed Jul 07, 2021 7:48 am There's no legal minimum speed limit on UK motorways, there is in some countries e.g. Germany but even then it's specific to lanes and the rule is something like the vehicle must be capable of 60 km/h (I think) on a flat road.
In the UK you can get pulled for dangerous driving if you are driving too slowly but there is no minimum legal speed limit.
I believe in the highway code it states that you must be travelling at least 50mph before joining a motorway. AFAIK this is widely interpreted as the 'minimum'.
But it was a good few years since I last read that :D
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Post by colonelpurple »

scott28tt wrote: Wed Jul 07, 2021 8:11 am
colonelpurple wrote: Wed Jul 07, 2021 6:49 am I didn't mean do 50 on a motorway, I just meant in general the most efficient speed

Did you consider this when driving an ICE car? Why worry about it now you have an EV?

(not being obtuse, I'm genuinely interested in your thought process)
sorry, is it not allowed to ask this ?

I have read some on this but always interested in info other people have come across

I travel at the speed I want, I dont care about range, but its interesting to know that if you are going x, if you go x+10 you are at the efficient horizon
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Post by Higgy »

A rough test I did the other day on the motorway was around 3.2miles/kWh at 80mph, and 3.7-3.9 at 70
Air con on and around 18degC.
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Post by ColinID3 »

I have found it is easy to regularly get 200 usable miles (20-30 miles left in reserve) by setting the speed limiter to 73mph, (it is so easy for the speed to creep up if you don't), plus use the A/C to pull the temperature down at the start of the journey, maintain with fresh air ventilation after that.
I've done 7,500 miles to date at least half of that is long distance motorway driving.
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Post by Daveion »

ColinID3 wrote: Wed Jul 07, 2021 9:32 am I have found it is easy to regularly get 200 usable miles (20-30 miles left in reserve) by setting the speed limiter to 73mph, (it is so easy for the speed to creep up if you don't), plus use the A/C to pull the temperature down at the start of the journey, maintain with fresh air ventilation after that.
I've done 7,500 miles to date at least half of that is long distance motorway driving.
Hi Colin
What is your long term average miles/kw?
I have done 3,000 miles in 6 months with a LTA of 4.2m/kw that includes the really cold start to the year. Im interested to see if my conservative driving makes much difference.
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Deleted User 192

Post by Deleted User 192 »

colonelpurple wrote: Wed Jul 07, 2021 8:20 am
scott28tt wrote: Wed Jul 07, 2021 8:11 am
colonelpurple wrote: Wed Jul 07, 2021 6:49 am I didn't mean do 50 on a motorway, I just meant in general the most efficient speed

Did you consider this when driving an ICE car? Why worry about it now you have an EV?

(not being obtuse, I'm genuinely interested in your thought process)
sorry, is it not allowed to ask this ?

I have read some on this but always interested in info other people have come across

I travel at the speed I want, I dont care about range, but its interesting to know that if you are going x, if you go x+10 you are at the efficient horizon

Of course you can ask whatever you want.

I was genuinely interested in why you were asking, as I mentioned.

Thanks for answering.
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Post by OllyExeterID3 »

scott28tt wrote: Tue Jul 06, 2021 8:09 pm 1. The speed limit is 70
2. I don’t work in kWh/mi but you should get a range reading of 220-240 miles I expect, so I guess that makes it about 4kWh/mi
3. Battery pack is 58kWh usable, 62kWh total
Absolutely point number 1. - you're breaking the law going about 70 so shouldn't be going above this.

Main sweet spot for me, cruising at 65-66mph gives a 4miles/kWh on the motorway. Even better with ACC because you can 'latch' to a car in front which can help (many-a-time I have cursed a lorry for leaving the motorway when I was slipstreaming it.
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Post by monkeyhanger »

In a car that can cost pennies to fuel with Octopus GO, I'm amazed how efficiency obsessed some people are. If you're doing a 210 mile round trip and want to get there and back without stopping to charge, I could understand that, but to obsess about tootling around at 55-60 miles an hour to perhaps save literally a couple of pence totally astounds me.

In the Summer with a dab of aircon:-

60mph cruise speed ~ 4.4mi p kWh
70mph cruise speed ~ 3.6mi p kWh
80mph cruise speed ~ 3.2mi p kWh

Unless you're embarking on a 200+ mile journey, drive it like you stole it or drive it like a nun might be the difference of saving £3 a month.
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Post by G43FAN »

OllyExeterID3 wrote: Wed Jul 07, 2021 11:58 am
scott28tt wrote: Tue Jul 06, 2021 8:09 pm 1. The speed limit is 70
2. I don’t work in kWh/mi but you should get a range reading of 220-240 miles I expect, so I guess that makes it about 4kWh/mi
3. Battery pack is 58kWh usable, 62kWh total
Absolutely point number 1. - you're breaking the law going about 70 so shouldn't be going above this.

Main sweet spot for me, cruising at 65-66mph gives a 4miles/kWh on the motorway. Even better with ACC because you can 'latch' to a car in front which can help (many-a-time I have cursed a lorry for leaving the motorway when I was slipstreaming it.

I hadn't thought of the significance of slipstreaming.. I now picture a future where there are pelotons' of EV's migrating along the roads with the fool hardy clearing off alone in the distance only to be caught at the end of the journey when they have had to preserve their remaining battery..
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Post by colonelpurple »

monkeyhanger wrote: Wed Jul 07, 2021 12:43 pm In a car that can cost pennies to fuel with Octopus GO, I'm amazed how efficiency obsessed some people are. If you're doing a 210 mile round trip and want to get there and back without stopping to charge, I could understand that, but to obsess about tootling around at 55-60 miles an hour to perhaps save literally a couple of pence totally astounds me.

In the Summer with a dab of aircon:-

60mph cruise speed ~ 4.4mi p kWh
70mph cruise speed ~ 3.6mi p kWh
80mph cruise speed ~ 3.2mi p kWh

Unless you're embarking on a 200+ mile journey, drive it like you stole it or drive it like a nun might be the difference of saving £3 a month.
completely agree

on one hand I think having an understanding of efficiency, which you can employ as the journey needs is a good thing, but its seriously taking away enjoyment of the car by limiting your speed, cheaping out on comfort (ACC or heating) or having to jump from lorry to lorry on the motorway (strikes me as dangerous as well)

It is also looking like we have to charge our ID3 less times a month then I had to fill up the BMW 2. Simply as the ID3 is more efficient in town where most of our driving is, and I think the range is actually much further in town then a petrol car. On the motorway, 120m to Bournemouth is 1/3 tank of petrol. Just over half on the ID3. Crucially, it doesnt effect anything about the journey or fill up frequency on holiday ...
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Post by roadhawk »

monkeyhanger wrote: Wed Jul 07, 2021 12:43 pm

In the Summer with a dab of aircon:-

60mph cruise speed ~ 4.4mi p kWh
70mph cruise speed ~ 3.6mi p kWh
80mph cruise speed ~ 3.2mi p kWh

This pretty much matches what I see. I do a regular run of 165 miles from Oxford to Leeds , with ACC set to 70-72mph, AC ON usually around18C and get 3.7 miles/kwh in the dry. I found this last Sunday that with some rain at the start consumption was up a tad and ended at 3.6.
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Post by Daveion »

colonelpurple wrote: Wed Jul 07, 2021 1:40 pm
monkeyhanger wrote: Wed Jul 07, 2021 12:43 pm In a car that can cost pennies to fuel with Octopus GO, I'm amazed how efficiency obsessed some people are. If you're doing a 210 mile round trip and want to get there and back without stopping to charge, I could understand that, but to obsess about tootling around at 55-60 miles an hour to perhaps save literally a couple of pence totally astounds me.

In the Summer with a dab of aircon:-

60mph cruise speed ~ 4.4mi p kWh
70mph cruise speed ~ 3.6mi p kWh
80mph cruise speed ~ 3.2mi p kWh

Unless you're embarking on a 200+ mile journey, drive it like you stole it or drive it like a nun might be the difference of saving £3 a month.
completely agree

on one hand I think having an understanding of efficiency, which you can employ as the journey needs is a good thing, but its seriously taking away enjoyment of the car by limiting your speed, cheaping out on comfort (ACC or heating) or having to jump from lorry to lorry on the motorway (strikes me as dangerous as well)

It is also looking like we have to charge our ID3 less times a month then I had to fill up the BMW 2. Simply as the ID3 is more efficient in town where most of our driving is, and I think the range is actually much further in town then a petrol car. On the motorway, 120m to Bournemouth is 1/3 tank of petrol. Just over half on the ID3. Crucially, it doesnt effect anything about the journey or fill up frequency on holiday ...
I can see the points made but as a slower
long-journey driver I dont limit my speed primarily for efficiency. I choose a speed I'm comfortable with for the road Im travelling and the duration of the journey. Im not missing out on anything. Its actually more enjoyable on long runs.
I confess to being mean with cabin temperature though. The wasted combustion heat is the only thing I miss from an ICE.
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Post by Warminster id »

I agree with daveion
Just enjoy the ride and relax
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Post by OllyExeterID3 »

Warminster id wrote: Thu Jul 08, 2021 8:44 am I agree with daveion
Just enjoy the ride and relax
Yep me too! Since we moved over to EVs, it was initially efficiency that I was obsessed with but then I realised that I enjoyed cruising at 65mph on motorways and generally just enjoyed the journey more! When charging infrastructure was worse (the heady days of 2017/18), it was more about making sure we had enough range to get to a 'plan B' charger on a long journey (with 10 miles range left and two chargers broken....we have had a few close moments!). For any 200 mile or less round trip, then it isn't an issue.

But yes, slow and steady, enjoy the ride, probably won't take you any longer with traffic etc!
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Post by ColinID3 »

ColinID3 wrote: ↑
Wed Jul 07, 2021 9:32 am
I have found it is easy to regularly get 200 usable miles (20-30 miles left in reserve) by setting the speed limiter to 73mph, (it is so easy for the speed to creep up if you don't), plus use the A/C to pull the temperature down at the start of the journey, maintain with fresh air ventilation after that.
I've done 7,500 miles to date at least half of that is long distance motorway driving.
Hi Colin
What is your long term average miles/kw?
I have done 3,000 miles in 6 months with a LTA of 4.2m/kw that includes the really cold start to the year. I'm interested to see if my conservative driving makes much difference.
Hi Dave
I am sitting at 3.8m/kWhr. over 4800 miles, (since 2.1 upgrade)
I don't focus on energy consumption on journeys under 150 miles - I enjoy the standing start acceleration when ever possible!
On longer journeys if I have a convenient coffee stop/short-top-up I do.
My c. 200 mile journeys are always to a location (eg home!) where I have100% confirmed charge at the end of the journey. The fastest door to door time on these journeys is to contain the cruise speed and don't stop to charge!
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Post by monkeyhanger »

For me there's nothing worse than sitting at 60-65mph and being stuck with all the trucks trying to overtake each other doing 1mph quicker than the other one, having the ACC slow you down when you get close as everyone else sails past you. Must feel good to know that you saved.8p in electricity on that 50 mile journey.

Save another 5p by sweating buckets in your car because having the aircon on knocks 0.2 miles per kWh off your efficiency. Absolutely crazy.

Hanging off a truck'sback bumper by hypermiling in its slipstream is just bonkers too, as well as dangerous.
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Post by Daveion »

ColinID3 wrote: Fri Jul 09, 2021 10:12 am
ColinID3 wrote: ↑
Wed Jul 07, 2021 9:32 am
I have found it is easy to regularly get 200 usable miles (20-30 miles left in reserve) by setting the speed limiter to 73mph, (it is so easy for the speed to creep up if you don't), plus use the A/C to pull the temperature down at the start of the journey, maintain with fresh air ventilation after that.
I've done 7,500 miles to date at least half of that is long distance motorway driving.
Hi Colin
What is your long term average miles/kw?
I have done 3,000 miles in 6 months with a LTA of 4.2m/kw that includes the really cold start to the year. I'm interested to see if my conservative driving makes much difference.
Hi Dave
I am sitting at 3.8m/kWhr. over 4800 miles, (since 2.1 upgrade)
I don't focus on energy consumption on journeys under 150 miles - I enjoy the standing start acceleration when ever possible!
On longer journeys if I have a convenient coffee stop/short-top-up I do.
My c. 200 mile journeys are always to a location (eg home!) where I have100% confirmed charge at the end of the journey. The fastest door to door time on these journeys is to contain the cruise speed and don't stop to charge!
Thanks Colin
Its not a huge difference is it. The only thing I need to relax a bit is the use of the heating. I use the power and torque when Im on my own so totally happy with my mixed driving /slower speeds on the longer runs.
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Post by Deleted User 314 »

monkeyhanger wrote: Fri Jul 09, 2021 1:22 pm For me there's nothing worse than sitting at 60-65mph and being stuck with all the trucks trying to overtake each other doing 1mph quicker than the other one, having the ACC slow you down when you get close as everyone else sails past you. Must feel good to know that you saved.8p in electricity on that 50 mile journey.

Save another 5p by sweating buckets in your car because having the aircon on knocks 0.2 miles per kWh off your efficiency. Absolutely crazy.

Hanging off a truck'sback bumper by hypermiling in its slipstream is just bonkers too, as well as dangerous.
We drive our car for fun and we really have fun, even clocking the km remaining dropping like a stone when we're zooming up a hill

We have a cursory look at the KM remaining and then just drive it. Aircon set to 21.5 winter and summer and drive away.

We've had the car long enough to know where all the free fast chargers are (and there are a lot here) and where the chargeable ones are located too.

The minute either of are quibbling over 5c here or there then we go ICE

And we ain't going ICE ever again :D
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Post by Daveion »

monkeyhanger wrote: Fri Jul 09, 2021 1:22 pm For me there's nothing worse than sitting at 60-65mph and being stuck with all the trucks trying to overtake each other doing 1mph quicker than the other one, having the ACC slow you down when you get close as everyone else sails past you. Must feel good to know that you saved.8p in electricity on that 50 mile journey.

Save another 5p by sweating buckets in your car because having the aircon on knocks 0.2 miles per kWh off your efficiency. Absolutely crazy.

Hanging off a truck'sback bumper by hypermiling in its slipstream is just bonkers too, as well as dangerous.
🤣 That is as far from the way it works for me as you can get. If I find myself in a convoy I pass it and hit Resume which is likely to be around 63mph 😂.
Hypermiling/ slipstreaming is not something I do.
What I like about this thread is that we are all different. There is no right or wrong way. Nothing bonkers or crazy. You like to drive faster and reach a destination a little earlier. I like to enjoy the drive and relax, its not about cost. Others maybe are focused on max efficiency. Each to their own.
I will look out for you zooming by me to the next queue on the M25 😁
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