1% battery use per mile

[Monke]

I got about 2 - 2.3 miles per kW (45-60 F, 65-75mph, about 2000 feet grade change, no heat) on a select RWD. The numbers are from several trips. For the worst case scenario, 100% would be around 142 miles. I was barely made it to the next EA station at 80% charge when it was months old. A SR MME would end up being a city car after several years in service.

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[rhougey]

I can assure you, the headlights don't meaningfully impact range. Rough energy usage:

Headlights: 0.1 kW
heated seats: 0.1 kW
heater: 6kW
maintaining 70mph: 25kW

My apologies, in my post I should have referred to darkness instead of headlights for nightime driving.

BTW, a drain of 200 watts for 3-1/2 hours will cost you about 2 miles of range. That’s not entirely insignificant when you anticipate rolling into your destination on a cold night with 8-10 miles remaining.

 

[superdave80]

It's like when the government tells us we should set the furnace at 68F in the winter

I always have mine set to 67. I have yet to die any of these winters. Ok, ok, I live in California, so a little different (but we still hit freezing temps in winter), so how is 68 a 'crazy' ask for a furnace setting?

 

[superdave80]

Title: "1% battery use per mile"

But also:

Ended up using 85% of battery for 160 miles

 

[Nomadfan]

Your battery getting significantly colder on the way back was definitely cutting down the range. For a standard range pack, ~180 miles of winter range is pretty normal.

Once ambient temperature dropped below 30 degrees, usage has gone from 3.1mi/kwh to 2.1mi/kwh. Regardless of the reported range, which has been extraordinarily optimistic, this past week the effective range of my standard battery at 90% charge is about 125 miles over my normal, flat work commute. That's about 40% less than warm weather range but, stranger still, it's about 32% less that the car is predicting it will get. I've learned to completely disregard the estimated range because it isn't even close to accurate. I wish I was getting ~180 miles from my standard battery.

 

[dbsb3233]

I always have mine set to 67. I have yet to die any of these winters. Ok, ok, I live in California, so a little different (but we still hit freezing temps in winter), so how is 68 a 'crazy' ask for a furnace setting?

Because that would make us quite chilly in our own house. We find 72F (+/- 1F) comfortable for both winter and summer. We find 4F colder than 72 in the winter uncomfortably chilly. And 6F hotter than 72 in the summer uncomfortably warm. Simply "not dying" is not our objective. Comfort is.

But to each their own.

 

[ArthurDOB]

The temperature here in Minnesota is dropping, and I've been interested to note the drop in range. While certainly noticeable, for me, it is not a problem.

I tried preconditioning this Monday morning when the temp was 18 degrees F (~ -8 C). I was at 221 miles at 100% (Standard Range) when I left the house. So, I'm impressed with preconditioning that actually works as adv. My commute is 2.5 miles, one-way, so I likely won't do that very often, but it's nice to know it works well. Between going to work and putzing around town for one thing or another, I am currently at 61% SOC and 86 miles of range.

I drove to Madison, WI and back (~500-mile round-trip, 70-75 mph average) a week ago, and while I didn't have the range I normally would when it's warmer, I had no concerns getting to a DCFC on the way there or coming back. I was running the heater (70 - 74 degrees F) and heated seats (lowest setting) the entire way.

OP, I'm not sure what you were expecting. It's not like range loss in the cold (or headwinds) is a mystery. It is what it is and you work with it. That's my attitude, anyway.

 

[Jperns]

Yeah I live in colorado and park outside. My MMEPE IS AWESOME, but I should have waited till I had a garage or moved out of this state. Soon baboon soon

 

[AngryMan]

My Mach will be 3 years old in March . I have yet to turn on the heat ...and I live in Ohio .
I bought a nice coat which I never wore in an ICE but I do now in the Mach.
I worked outside for 30 years so you kids might not wanna try this at home.

 

[Mach1E]

I don't know why it happens, but it's not the heat or cabin climate. Yesterday I wrote my post when I got home from doing the same roundtrip drive.

When I left home in the morning my battery temp in my R1T was 75 and the outside temp was 32. When I returned my battery temp was 101 and outside was 48. Winds were calm at 2mph from the east mostly which should have no impact.

John might be right with density of the air. I'm not claiming it has to do with just headlights, but something happens at night to cause less efficient driving. My R1T is much less impacted than my MME was, but nonetheless it still happens. I'll look at the same data driving my M3P when I pick it up Thursday.

Interesting. Could be a humidity and dew point thing too? But even so I don’t think it would make a measurable difference compared with battery temp.

I do wonder if the road temps in the daylight are significantly higher and that’s enough to keep the battery warmer.

I know in the summer the roads can be 25-30 degrees warmer than ambient during the daytime.

 

[mkhuffman]

I don't know why it happens, but it's not the heat or cabin climate. Yesterday I wrote my post when I got home from doing the same roundtrip drive.

When I left home in the morning my battery temp in my R1T was 75 and the outside temp was 32. When I returned my battery temp was 101 and outside was 48. Winds were calm at 2mph from the east mostly which should have no impact.

John might be right with density of the air. I'm not claiming it has to do with just headlights, but something happens at night to cause less efficient driving. My R1T is much less impacted than my MME was, but nonetheless it still happens. I'll look at the same data driving my M3P when I pick it up Thursday.

Interesting. Could be a humidity and dew point thing too? But even so I don’t think it would make a measurable difference compared with battery temp.

I do wonder if the road temps in the daylight are significantly higher and that’s enough to keep the battery warmer.

I know in the summer the roads can be 25-30 degrees warmer than ambient during the daytime.

I bet it is road temperature and tire temperature, or something similar that is increasing rolling resistance at night. Rolling resistance can have a huge impact - low tire pressure can significantly reduce range. I wonder if the average tire pressure is lower at night? Not saying it is tire pressure, but something (or multiple somethings) that is impacting rolling resistance.

 

[Mach1E]

I bet it is road temperature and tire temperature, or something similar that is increasing rolling resistance at night. Rolling resistance can have a huge impact - low tire pressure can significantly reduce range. I wonder if the average tire pressure is lower at night? Not saying it is tire pressure, but something (or multiple somethings) that is impacting rolling resistance.

Hadn’t thought of tire pressure, but for sure!

Sunlight on the tires and road can significantly impact tire pressure.

 

[Kamuelaflyer]

You should give -20F a try!

Wait, temperature can be negative????

 

[AKgrampy]

Wait, temperature can be negative????

OK - I could convert to Kelvin and keep it positive just for you!

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