It can coast, too!

[generaltso]

People preferring 2PD just proves to me that not enough people know how to drive a stick.

Which makes me sad.

Huh? I‘ve driven manual transmissions for years, yet I prefer 2PD in the MME. What’s the correlation? If you know how to drive with 3 pedals, you’re supposed to prefer 1 pedal?

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[stealthytolkien]

Same with my wife and me with the RX450H. She drives it like it's stolen and gets nearly 29mpg. I woosiefoot it and manage 24mpg.

We have a 2021 and barely manage to get 28 mpg (we need to drive like two grandmas in one to get there), lol.

 

[stealthytolkien]

People preferring 2PD just proves to me that not enough people know how to drive a stick.

Which makes me sad.

Don’t be sad, nobody cares. Instead, work on stating coherent correlations.

 

[azerik]

We have a 2021 and barely manage to get 28 mpg (we need to drive like two grandmas in one to get there), lol.

Apparently you need to beat on it, works for her.

 

[goodguy]

The hypermile comments are interesting to me.

I have tried whisper with 1PD off during my 143 mile commute and efficiency was much worse than when I use 1PD. I made a very diberate attempt to coast and avoid excessive acceleration and deceleration, anticipating traffic flow. In a ICEV, that would have resulted in much better fuel economy, but not in my MME. The difference shocked me actually, because I expected the opposite.

I used to advocate for coasting to improve efficiency, but based on my real world results, I don't think that is the most efficient way to drive the MME.

honestly that makes no sense. everytime you convert battery to power and back there is efficiency lost. When it reports 100%. It is reporting that 100% of the power that could be converted was. Not 100% efficiency. Makes no sense to accelerate to then need regen is more efficient.

 

[mkhuffman]

honestly that makes no sense. everytime you convert battery to power and back there is efficiency lost. When it reports 100%. It is reporting that 100% of the power that could be converted was. Not 100% efficiency. Makes no sense to accelerate to then need regen is more efficient.

Exactly, which was why I was so surprised at the result. Shocked, actually. So, I think I know why it is true.

When you slow down, you can slow down using friction (from the air and the surface of the road), or you can slow down using regen and friction. Slowing very gradually, especially at high speeds, could be 100% from air resistance and tire rolling resistance. If you slow down quickly, you get some regen out of it. When coasting, you are never getting any regen, and all energy to stop the vehicle is getting wasted in air and rolling resistance.

Maintaining your speed as long as possible, and then slowing down at maximum regen (without using the friction brakes) will give you the best efficiency. Coasting to a stop will never be more efficient because you end up stopping at the same place, but you gain nothing from the stopping process.

This assumes you are traveling at the same speed before slowing down. If you drive slower, of course you will be driving more efficiently. Speed kills efficiency. But if you drive at the same speed, you should not coast to a stop if you want to gain anything back from the stopping process.

 

[goodguy]

You would have used less power before you brake. That’s the savings. I coast with my fusion Energi where the battery is small and every little bit helps. Coasting helps quite a bit. 10-15 percent I would estimate. Staying 45 mph and under also helps a lot. With batteries. Temp matters, weight matters, ac usage etc. the miles left is not that accurate.

 

[mkhuffman]

You would have used less power before you brake.

I think the power saved by slowing down earlier is not sufficient to offset the gain from regen. And from what I have seen with my MME, that is the case. It could be the Energi didn't have good regen capabilities. The MME regen is significant.

Driving more slowly is a different issue from coasting. You can drive 45 and then slow later, capturing some regen, even if you drive 45.

 

[goodguy]

We agree to disagree. For example I can stop the gas and put in neutral and coast the entire way down a long ramp. Timing it perfect to stop at the signal. If I fall short I’d have to throttle and it is clear how much power is used. You are overestimating the amount regen-ed. It’s simple physics. Power is lost when converting both ways. With all this said I don’t worry about this as much with the Mach e. But I do like the engage for most uses and if I need a little more coasting I can put it in neutral to make it the extra distance. For these reason I dislike unbridled and I pedal. Whisper gives the most coast but does not work for all occasions. I’m out on this topic. But your reasoning is not correct.

https://4frontenergy.com/blog/what-is-regenerative-braking/

this gives numbers for the losses.

consider this. Starting with full battery, person A accelerates to 88mph and then coast to stop in neutral and repeats until the battery is depleted. Person B does the same but stops with regen until the battery is done. Person A will travel further and that method will be proven to be more efficient.

 

[ctenidae]

Don’t be sad, nobody cares. Instead, work on stating coherent correlations.

I think 1PD and driving a stick are very similar. If you can drive a stick you probably prefer 1PD. If you can't drive a stick, you probably prefer 2PD.

Some people prefer 2PD, therefore some people can't drive stick. If even one person can't drive stick, too many people can't drive stick.

Coherent enough?

 

[ctenidae]

LOL all of my cars are stick other than the MME. ?‍?

I've never owned an automatic. Tesla and MME don't count because they don't have geared transmissions. I really only got the Tesla because there weren't any sticks that I wanted when the time came to get a new car!

 

[ctenidae]

Huh? I‘ve driven manual transmissions for years, yet I prefer 2PD in the MME. What’s the correlation? If you know how to drive with 3 pedals, you’re supposed to prefer 1 pedal?

I think so, just because engine braking is very similar to regen braking. I made almost no change to my driving style, at least as far as following distance and braking points are concerned.

Am I the only person who used the gas pedal to slow down? I could do stop and go traffic without touching the brake pedal in my old 6, in 65k miles never had to replace brake or clutch pads. The transition to an EV was easy.

 

[superdave80]

Well you never really coast unless you are in neutral or maybe perfect 1 PD operator.

What would make 1PD able to coast, but not 2PD? I coast all the time in 2PD mode.

 

[superdave80]

I think so, just because engine braking is very similar to regen braking.

2PD driving also uses regen, so it doesn't matter if you prefer 1PD or 2PD.

 

[AKgrampy]

What would make 1PD able to coast, but not 2PD? I coast all the time in 2PD mode.

I never use 1 PD so am unsure if there is a sweet spot where you may be neither in regen nor accel so perhaps coasting. I guess maybe that is also possible in 2 PD but most of my driving is around town so I am always either in accel or regen as far as I can tell. If I needed/wanted to coast I would switch to N myself.

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