What's a good kw per mile range (on highway) for extended range battery?

mkhuffman

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That's interesting. Is that one of the infinite gear ratio transmission cars? I know in my F150, once it kicks into the final overdrive gear (10th) around 52mph, then the efficiency is all diminishing as I increase speed. There is nothing further to reduce drive train resistance and it is all wind drag.

I know nothing about Acuras but that would be interesting if your model has less resistance in the drivetrain at higher speeds (again, I'm dumb on this) like those infinite gear transmissions. Or if the airflow just becomes most laminar at that speed.

I know when I commute to the bay area in my daughter's Hyundai Venue (shaped minicooper-ish) I would expect lots of drag but whether I'm in a congested commute averaging 65mph or free flowing 80mph, I consistently get 38mpg on a trip!
ICE vehicles are more efficient at higher speeds because they are so inefficient at stop and go, and slower speeds. It is comparing very inefficient driving with very efficient driving, even when speeds are causing much more drag on the car.

I expect transmissions in BEVs will become more common to improve highway range, like Porsche did. The Tycan gets really good highway range compared with the competition.
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ICE vehicles are more efficient at higher speeds because they are so inefficient at stop and go, and slower speeds. It is comparing very inefficient driving with very efficient driving, even when speeds are causing much more drag on the car.

I expect transmissions in BEVs will become more common to improve highway range, like Porsche did. The Tycan gets really good highway range compared with the competition.
Oh! I was interpreting his comparison as 80mph was the sweet spot of pure highway speeds (compared to say, 72mph) not compared to stop and go driving. I 100% agree any freeway driving will be more efficient than stop and go driving in non-hybrid ICE vehicles.
 

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Owner of a 2022 Premium AWD, with extended battery here. When following every single word written about Mach-Es prior to my delivery, I read where using 55mph as a baseline, you get 20% less efficiency at 65mph. Go up to 75mph and your efficiency drops 44% compared to 55mph. I don't have hard data to support that, plus I cannot remember where I read those efficiency numbers, but it seems about right during my first 2.5K miles in my driving experience.
 

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Hello all,
Can anyone explain what good highway range should be on the extended range battery? took a 120 mile trip yesterday and paying attention the KW usage it seems like 2.7 miles per KW was about average if I was going 75 mph or less anything more than that and it dropped down to 2.2 to 2.4 Around town it seems to be in the 3.1 to 3.5 Is this normal use?
Well you’re gonna have some different numbers here. But first I don’t ever go over 65 mph but gives me 3.5 but 62 mph gets 3.7 and that’s with AWD ext range I am pretty conservative driver
 

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I have a 47 mile commute to work. 35 miles of that is on the freeway at 72 to 75 MPH, with the rest of it being somewhere between 35 and 50 MPH on local streets and highways. AC set to Auto and 72 degrees. Going to work I get 3.5 miles per kWh. Coming home it is 3.1 miles per kWh. Averages out to 3.3 miles per kWh. I do have a fair number of hills I have to go up/down, and obviously the commute to work has more of an overall decline to it. Charge at 100% is usually between 260 and 270 miles of range for a car that the EPA rates at 303. The drop in range is inline with similar MPG drops we see with our gas cars, i.e. a car that the EPA says gets 27 MPG overall usually gets around 24 to 25 MPG.
 


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Hello all,
Can anyone explain what good highway range should be on the extended range battery? took a 120 mile trip yesterday and paying attention the KW usage it seems like 2.7 miles per KW was about average if I was going 75 mph or less anything more than that and it dropped down to 2.2 to 2.4 Around town it seems to be in the 3.1 to 3.5 Is this normal use?
The answer, as always, is "it depends". AWD has about 10% less efficiency than RWD, but the much bigger determinants are speed and temperature.
  • In warm weather with my RWD I get probably 3.0 to 3.3 at highway speeds (which for me is 73mph)
  • My commute is a mix of highway and back roads that average about 50mph (takes me about an hour to drive around 50 miles). In warm weather I get 3.5 mi/kwh
  • In February or march with 20 degree temps I got 2.5 mi/kwh on the highway, and roughly 2.8 on my commute
 

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That's interesting. Is that one of the infinite gear ratio transmission cars? I know in my F150, once it kicks into the final overdrive gear (10th) around 52mph, then the efficiency is all diminishing as I increase speed. There is nothing further to reduce drive train resistance and it is all wind drag.

I know nothing about Acuras but that would be interesting if your model has less resistance in the drivetrain at higher speeds (again, I'm dumb on this) like those infinite gear transmissions. Or if the airflow just becomes most laminar at that speed.

I know when I commute to the bay area in my daughter's Hyundai Venue (shaped minicooper-ish) I would expect lots of drag but whether I'm in a congested commute averaging 65mph or free flowing 80mph, I consistently get 38mpg on a trip!
I'm not sure. It was a 2011 TSX. Four cylinder, 200 bhp (no turbo). That 30-35 mpg was purely highway. In reality, it steadily averaged 24 mpg city/highway over seven years. Not great when premium was over $5/gallon. 😕
 

Guss-E 2021

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Oh! I was interpreting his comparison as 80mph was the sweet spot of pure highway speeds (compared to say, 72mph) not compared to stop and go driving. I 100% agree any freeway driving will be more efficient than stop and go driving in non-hybrid ICE vehicles.
And by "sweet spot" I meant that was about the fastest I could drive without taking a real hit on fuel economy. It was probably closer to 31 mpg @ 80 mph and 35 mpg @70-75. My ex wife has the car now. I should borrow it back and test it again 🙂.
 

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I do wonder if Ford has gone back to the wind tunnel on the Mach-E.
If you want a car styled to do well in a wind tunnel, you always end up with an egg (see: Tesla). The MachE has obvious compromises, but I'm glad they didn't go the Mercedes EQS route and make a blob with a pony emblem.
 

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I usually set the cruise on 73, sometimes 75. 2.9 - 3.1. Do the math at each charge stop and you will see two things. First, your average is below what you think. Second, individual legs can differ quite a bit depending on altitude changes, etc.
 

Guss-E 2021

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If you want a car styled to do well in a wind tunnel, you always end up with an egg (see: Tesla). The MachE has obvious compromises, but I'm glad they didn't go the Mercedes EQS route and make a blob with a pony emblem.
Right. I'm pretty sure Ford is focusing on weight reduction. I remember reading an interview with someone at Ford who said as much. Though LFP batteries are heavier on a kW/gram basis so maybe not 🤷
 

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I see anywhere from 2.2 (when it's cold, have a bikes on the back, or I'm driving faster than I should be (which only happens for science ;))) to 3.2 m/kWh. Driving normally @ 80mph in decent weather with nothing on the back I get ~2.7-2.8, 3.0-3.2m/kWh if I'm drafting trucks at 70mph.
 

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It seems 70 mph is a tipping point...most of our local highways have 55 mph limits, so driving 60ish we regularly get mid to high 3s in miles per kWh. On our roadtrip, getting closer to 70 mph we still got low-mid 3s, but over 70 dropped us into the 2s.
 

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I see anywhere from 2.2 (when it's cold, have a bikes on the back, or I'm driving faster than I should be (which only happens for science ;))) to 3.2 m/kWh. Driving normally @ 80mph in decent weather with nothing on the back I get ~2.7-2.8, 3.0-3.2m/kWh if I'm drafting trucks at 70mph.
That is very impressive for a GT/PE.

In our GT (not PE) we usually get ~1.8 to 2.0 in the cold and 2.3 to 2.5 when it is warm, but that is at ~72mph - not 80! Anything above 75 and we are back down to 2.0 to 2.2. Only time I have seen anything approaching 2.7-2.8 on a trip is when we stuck to side street and 45-55mph.

What is your secret?
 

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That is very impressive for a GT/PE.

In our GT (not PE) we usually get ~1.8 to 2.0 in the cold and 2.3 to 2.5 when it is warm, but that is at ~72mph - not 80! Anything above 75 and we are back down to 2.0 to 2.2. Only time I have seen anything approaching 2.7-2.8 on a trip is when we stuck to side street and 45-55mph.

What is your secret?
Efficiency is very particular to terrain. If you drive on a flat highway at 70 - 75 mph, you'll see very close to 3.0. If the road is gaining altitude, and then losing altitude, it has a big impact. You see absurd figures posted by people in Florida on flat roads, or Arizona. In upstate NY, your roads aren't flat, so I would expect 2.8 or so.
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