[jefro]

I had a BMW i3 that should have been able to do my daily drive when I bought it. Something like 90 miles charge or such I forget. It was able to monitor the energy use very finely so that I could easily see how much it took on hills and how little it would return downhills. Made sense after I thought about it. Same for Bolt EV.

I used to drive F150's for last few decades on same route. Each model tended to get better mpg but still reported mpg on dash or round trip as higher than the 60 miles nominal.

My wife had a 2500 GMC duramax that would putter up the hills without so much as a huff or puff. I ran it to work a few times using the dic to report what it returned. I think it was 22 mpg or maybe a bit better. That truck did get 30 mpg going down I-10 in W. Texas at 65MPH all day long.

 

[MichBolt]

We should test this the same way Mythbusters tested the myth of a dirty car being more efficient than a clean car - measuring the fuel used.

First, remove the battery from the car. Then weigh the battery before the first trip...

 

[Tim]

After looking at professor Roper's graph above and considering my actual experience, I can see I was inappropriately confident that option 1 is better. At 30 mph, the range is about 380 miles (pre-battery replacement, but that's irrelevant). At 47.5 mph, the range is about 313 miles, only 18% less. My actual experience is that when I take the "long way around", I'm going about 64 mph, which would be a much bigger hit on efficiency.

 

[jefro]

The graph is useful but as noted above a few factors are not yet known. Altitude changes and how many stops on the stop and go part.

I hate it when graphs end at 95MPH.

 

[PLP]

We should test this the same way Mythbusters tested the myth of a dirty car being more efficient than a clean car - measuring the fuel used.

I wax my car as it helps with air drag. Smoother surface, less air drag.

The graph is useful but as noted above a few factors are not yet known. Altitude changes and how many stops on the stop and go part.

I hate it when graphs end at 95MPH.

You are right, it should have ended at 92 mph.

Overall, no altitude change.
But on the Trip 1 there is an intersection on the downhill. I hate this one as you must be almost on the top of the hill to see the lights.

View attachment 42546
After looking at professor Roper's graph above and considering my actual experience, I can see I was inappropriately confident that option 1 is better. At 30 mph, the range is about 380 miles (pre-battery replacement, but that's irrelevant). At 47.5 mph, the range is about 313 miles, only 18% less. My actual experience is that when I take the "long way around", I'm going about 64 mph, which would be a much bigger hit on efficiency.

Well, I am not sure which graph is more accurate. That is from... I wish I remembered, but it had a Anaconda (or Python ) code. Based on this, I found 30 mph to give 460 miles range @60 kWh battery, while 47.5 mph about 371 miles (7.66 and 5.30 miles/kWh respectively).

 

[efbolt]

I've been testing out my commute to work. It's about 16 miles a little downhill. Most of my drive is constant speed but there's about a mile of stop and go once I get downtown. Once downtown I'm generally going not going more than 35 mph.

Going mostly 45‐50 mph I get about 5 miles/kwh.
For 35‐40 mph, I get about 6 miles/kwh.

In both cases, when I hit downtown my efficiency per mile goes up even when I'm stopping for stoplights.

 

[MisterJJ]

View attachment 42550

I look at that graph and this what I see:

 

[PLP]

I look at that graph and this what I see:

weird...
I see this when I click on my post.

 

[MisterJJ]

weird...
I see this when I click on my post.

View attachment 42557

Guess I shoulda used a winky. The point is that the lower ranges aren't useful. I hope nobody is looking at that and thinking they'll drive everywhere at 17 MPH to maximize efficiency. Well... I expect that someone probably will. <sigh>

 

[efbolt]

Guess I shoulda used a winky. The point is that the lower ranges aren't useful. I hope nobody is looking at that and thinking they'll drive everywhere at 17 MPH to maximize efficiency. Well... I expect that someone probably will. <sigh>

That's actually relevant to the point I was trying to make though. If you are stop and go in a 25 or 35 mph zone, then you'll be spending additional time going about 15-30 mph. You don't just slow down instantly to 0 or speed up instantly to 35.

 

[PLP]

Guess I shoulda used a winky. The point is that the lower ranges aren't useful. I hope nobody is looking at that and thinking they'll drive everywhere at 17 MPH to maximize efficiency. Well... I expect that someone probably will. <sigh>

Oh, I see now. I think this is more of a theory than reality, but well, they got Kona to do over 600 miles... so who knows.

You don't just slow down instantly to 0 or speed up instantly to 35.

No?
Watch me! Yeah, that is my problem. I love the torque and... I buy tires too often.

 

[Herbie Bolt]

Guess I shoulda used a winky. The point is that the lower ranges aren't useful. I hope nobody is looking at that and thinking they'll drive everywhere at 17 MPH to maximize efficiency. Well... I expect that someone probably will. <sigh>

The posts @MisterJJ puts up of his IP seem to always have the blue Sport light lit.
Drive it like you stole it

 

[jefro]

Wouldn't driving it like you stole it cause you to drive cautiously? Maybe in a high crime area it makes sense so that no one robs you before you get to chop shop but in my area you'd get caught going fast before they caught you stealing I'd think. And if I were to drive it fast, I'd want to go well over 95 mph.
Should have put a on that.

 

[PLP]

An real life update.
Digression first - A real life update or An real life update, because it would be An update, right? So am I referring to the update as the key word or what?
English is my second language, so sometimes I get into this black hole of English rules, or lack of.

Here we go.
One day we had to drive separately, so my wife took the longer route, I took the shorter one. Oh, yeah, we drive together as we work in the same building.
We arrived basically at the same time. Actually, we met on the intersection, which connects the two routes!
So the time, in the MORNING is the same. Afternoon - forget about taking the shorter trip as it will be 20% longer due to the traffic. But that might not be a problem for EV, read below.
Then, the other, time I tested the trips energy wise, meaning what the bar display says.

Trip 1 (shorter) - energy bars were near or in low 6's
Trip 2 (longer) - energy bars were low to mid 5's.
No climate control use (heat or cool). Similar weather.
The only disclaimer - I tried to be civil. No hooning. Although, it is hard for me. just like Clarkson says - petrol-head boys stop developing at age of 9.

 

[Martin D]

An real life update.
Digression first - A real life update or An real life update, because it would be An update, right? So am I referring to the update as the key word or what?
English is my second language, so sometimes I get into this black hole of English rules, or lack of.

Here we go.
One day we had to drive separately, so my wife took the longer route, I took the shorter one. Oh, yeah, we drive together as we work in the same building.
We arrived basically at the same time. Actually, we met on the intersection, which connects the two routes!
So the time, in the MORNING is the same. Afternoon - forget about taking the shorter trip as it will be 20% longer due to the traffic. But that might not be a problem for EV, read below.
Then, the other, time I tested the trips energy wise, meaning what the bar display says.

Trip 1 (shorter) - energy bars were near or in low 6's
Trip 2 (longer) - energy bars were low to mid 5's.
No climate control use (heat or cool). Similar weather.
The only disclaimer - I tried to be civil. No hooning. Although, it is hard for me. just like Clarkson says - petrol-head boys stop developing at age of 9.

Not an English major, but it’s normal for “a” to be used when a noun or pronoun starts with a consonant, and “an” when the noun or pronoun starts with a vowel.

So “A real life update” is correct. If you leave out the Real life, the correct term is “An update”.


The a or an is determined by the word directly following it whether it is a pronoun or noun.

 

[MisterJJ]

Not an English major, but it’s normal for “a” to be used when a noun or pronoun starts with a consonant, and “an” when the noun or pronoun starts with a vowel.

Great that there's a universal rule like that.

 

[PLP]

Not an English major, but it’s normal for “a” to be used when a noun or pronoun starts with a consonant, and “an” when the noun or pronoun starts with a vowel.

So “A real life update” is correct. If you leave out the Real life, the correct term is “An update”.


The a or an is determined by the word directly following it whether it is a pronoun or noun.

Martin, I know this rule, but what makes me confused is - I refer to the update, not real hence the pronoun should be connected to the noun in question.
Just like verbs and conjugation

This is my scientific brain... which hates English for weird tenses (will have been done vs have been done - how past can refer o the future?) and hates pronunciation that follows no rules with an exception when it does

Polish is easier on this aspect.

 

[Martin D]

Martin, I know this rule, but what makes me confused is - I refer to the update, not real hence the pronoun should be connected to the noun in question.
Just like verbs and conjugation

This is my scientific brain... which hates English for weird tenses (will have been done vs have been done - how past can refer o the future?) and hates pronunciation that follows no rules with an exception when it does

Polish is easier on this aspect.

You have to realize that the same people who invented the English language also invented the SAE measurement system. Now does it make sense 😉

 

[jefro]

There should have been a KWH rating on dash or don't earlier models have that?

Anyway, which set was more effecient? I don't know bars.

Let the guy answer me before you go picking on him.

 

[efbolt]

There should have been a KWH rating on dash or don't earlier models have that?

Anyway, which set was more effecient? I don't know bars.

Let the guy answer me before you go picking on him.

Energy bars!

Seriously though. Any route I've taken slower speed--even due to stop and go--ends up being more efficient.