Range: who can explain?
Member
Joined: Aug 2014
Posts: 181
Likes: 57
From: Dallas TX
2022 EQS 450
The range is dependent on your driving habits and where you are driving. If you drive in the city and never go over 50 or exceed the speed limit your range is much better. If you drive like I do and mash the accelerator or drive over the speed limit and get the warning "please reduce speed", your range will suffer. There is a display in the center of the speedo that can be pulled up to give your driving a "grade" with green stars for better driving. I have to be really an old lady to get all the stars and a laurel wreath.
Thread Starter
Newbie
Joined: May 2022
Posts: 11
Likes: 4
EQS 450+
The range is dependent on your driving habits and where you are driving. If you drive in the city and never go over 50 or exceed the speed limit your range is much better. If you drive like I do and mash the accelerator or drive over the speed limit and get the warning "please reduce speed", your range will suffer. There is a display in the center of the speedo that can be pulled up to give your driving a "grade" with green stars for better driving. I have to be really an old lady to get all the stars and a laurel wreath.
Junior Member
Joined: Apr 2022
Posts: 39
Likes: 5
From: Atlanta, Georgia
EQS 450
I’ll add that the algorithm was apparently designed by the marketing department. I recently did a road trip. Charged to 100% and range was 531 miles. Actual range was about 375. Off by almost 30%.
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Member
Joined: Jan 2021
Posts: 152
Likes: 50
911
One has to realize that your range is strongly dependent on temperature, driving style (acceleration), and terrain (as in driving up a mountain). In an ICE car, only about 30% of the energy is used to move the car, the rest is lost as heat. In a BEV about 90% of the energy is used to move the car so you notice a 10% increase in energy usage much easier. Looking at terrain - let's suppose you gain 4400 ft in altitude in one hour; you would have expanded ~10kW in the hour or about 10% of the battery charge to climb this mountain in addition to the energy required to move the car horizontally - ignoring some minor effects. So assuming you drove ~30 miles to climb up this 4400 mountain, the change in altitude doubled the energy usage. As for temperature, the German MB website shows a calculator that indicates a decrease in range of 14% driving at 30degC, a decrease of 20% at 10degC and a decrease of 34% range at 0degC vs. driving at 20 degC.
So keep in mind that whatever clever algorithm is used it cannot predict your future consumption - it can only take a guess based on your past consumption. I do not know whether it averages over the past 1h or the past 4 h or if the averaging period is based on several variables. I would guess it is based on a relatively short period of <1h. Just a guess. Perjpas someone has greater insight into this. (Maybe they use a sophisticated Kalman filter).
So keep in mind that whatever clever algorithm is used it cannot predict your future consumption - it can only take a guess based on your past consumption. I do not know whether it averages over the past 1h or the past 4 h or if the averaging period is based on several variables. I would guess it is based on a relatively short period of <1h. Just a guess. Perjpas someone has greater insight into this. (Maybe they use a sophisticated Kalman filter).
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Out Of Control!!
Joined: Nov 2018
Posts: 11,311
Likes: 5,273
From: San Francisco Bay Area
2019 C63CS
The range indicator is not called the GOM (Guess-O-Meter) for no reason. As with the stock market, past performance is no guarantee for future performance. With an ICE, the predicted range is largely a function of the most recent consumption. Typically the last 18 miles of driving or so. Depends on the manufacturer and is sometimes stated in the owners manual. So filling up at the end of a long highway cruise gives a different range than filling up after tooling around in the city. Same goes for EVs, however there are additional factors. The recent consumption, probably about over a similar mileage as with an ICE, is only part of it. As mentioned above, ambient temperature is another major factor due to the battery performance dropping when it's cold. In addition there's the consumption of the AC depending on outside temperature. As said, those are much larger factors in an EV due to the low energy density. Most of the energy stored in the battery is used to propel the car, so any auxiliary use will be much more noticeable in an EV. Consider that heating the cabin in an ICE does not reduce fuel economy, because it's entirely done using waste heat that would otherwise escape into the environment. Heating an EV cabin takes away energy that could otherwise be used to drive the car. Similarly, an engine doesn't need to be actively heated or cooled. It's all passive, whereas an EV requires active heating and cooling of the battery for optimal performance. That again takes energy away and reduces your range.
Super Member
Joined: Nov 2021
Posts: 825
Likes: 263
From: NE KY, on the Ohio River
2018 S560; 2022 EQS450+
It’s almost impossible to me that anyone who’s been driving and refueling his vehicle as most electric car owners have, would not both understand and expect this,
(Shaking head in wonderment)
(Shaking head in wonderment)
MBWorld Fanatic!
Joined: Oct 2014
Posts: 4,524
Likes: 1,181
From: WI
17 E43; 21 GLS580
My guess you had been driving slow for a few days previously.
Super Member
Joined: Nov 2021
Posts: 893
Likes: 397
From: Hong Kong, China
2021 S450 4Matic
From the Owner Manual's ''Notes on the range":-
-If you have used the Navigation to plot a route ahead, the computer will take that future route into consideration. I reckon, this means the traffic condition ahead, the speed limits for various sections of the route, the terrain (altitude)...etc will all be considered
-exterior temp, interior temp, setting of the air conditioning are all considered. This factor, just like gasoline cars, should be relatively significant. AC is just a huge electricity hog.
-For previous individual driving habit, this could mean counting from the last time that the Trip Computer is reset. If you reset the trip computer, then all previous driving data/style will be deleted and calculated afresh from that point on.
-If you have used the Navigation to plot a route ahead, the computer will take that future route into consideration. I reckon, this means the traffic condition ahead, the speed limits for various sections of the route, the terrain (altitude)...etc will all be considered
-exterior temp, interior temp, setting of the air conditioning are all considered. This factor, just like gasoline cars, should be relatively significant. AC is just a huge electricity hog.
-For previous individual driving habit, this could mean counting from the last time that the Trip Computer is reset. If you reset the trip computer, then all previous driving data/style will be deleted and calculated afresh from that point on.
