The Most Efficient Car Ever Created? Mercedes EQXX

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Published 2023-01-20
What is the limit on efficiency for cars? How low can energy consumption go?!
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The Mercedes EQXX is the most efficient car Mercedes has ever created, and set out to achieve 1,000 kilometers on a single charge of a 100 kWh battery, with a goal of the elusive 10kWh/100km energy consumption benchmark. They did this by optimizing everything about the car for efficiency: aerodynamics, weight, rolling resistance, and powertrain efficiency. It even has some solar panels for a little extra juice! Were they able to achieve nearly double the range of today's EVs?

Mercedes EQXX Assumptions
For the energy consumption vs speed plot (flat ground, constant speed) an assumption is made for the electrical consumption of the vehicle at 250W. This value was chosen because Mercedes claims the solar setup on the EQXX is capable of generating (rough average) 25 km of range in a day. With an efficiency of 8.3kWh/100km, and knowing we get 25 km of range in a day from solar, we can divide 8.3kWh by 4 (25km = 1/4 of 100km) giving us a daily production of around 2 kWh from the solar system. Let’s assume 8 hours of good daylight, so 2kWh/8hr = 250W. Mercedes also told me there were times the solar output exceeded the overall system energy required, meaning at times the system was operating under (the assumed) 250W solar output.

References:
Highest EV MPG - www.fueleconomy.gov/feg/topten.jsp?year=all&action…
Highest ICE MPG - www.fueleconomy.gov/feg/topten.jsp?year=all&action…
Tesla Model S Stats - dis.epa.gov/otaqpub/display_file.jsp?docid=54291&f…
EQXX Tire Crr - media.mbusa.com/releases/mercedes-benz-vision-eqxx…
1200 km EQXX - media.mercedes-benz.com/article/7ff22683-8864-43a7…
Frontal Area Estimates - www.tesla.com/sites/default/files/blog_attachments…
Vehicle Efficiency Video -    • What You Should Know about EV Efficiency  
Energy Consumption Plot - www.researchgate.net/publication/350853224_Numeric…

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All Comments (21)
  • Many have asked about Aptera Motors, a car that's seeking maximum efficiency and using solar for added range (this EQXX also has solar, though only good for about ~2kWh per day, or about 25 km). I have a video on the Aptera solar math, seeing if it checks out! Here's the link: https://youtu.be/7L1_zvqg73Q
  • There is nobody with more charisma than an engineer explaining something complex in clear and concise detail. Guys like you should be out front more often; the world would run a lot better.
  • @JerGol
    Props to MB for optimising at normal driving speeds and not going for the easy result at 25kph, for avoiding extremes of design, and for keeping it a sensible size for a car. That's some good design spec right there!
  • Just love the speedtail look, just part of what makes it so economical, beautifully impressive
  • @arog7493
    I can not be the only one who would love to see the wheels covered for even more efficiency.
  • @johncarry5989
    What I find remarkable is that it actually looks like a nice car despite all the science. Apart from the skinny tires.
  • One of the finest, most comprehensive presentations I have ever seen. You are setting the standard for all others.
  • @electrodacus
    That powertrain efficiency is extremely impressive.
  • @Fawstah
    I think that is really smart to optimize for highway, since the only time an ev’s range typically matters is on roadtrips
  • @Alexandra-Rex
    But, and I am a bit surprised that you didn't answer this, how many F/KM does it take the penguin to move at highway speeds? (fish per kilometer).
  • @randxalthor
    Love your whiteboard videos. It's always so educational and it's wonderful having sourced and cited hard numbers to understand the industry and which manufacturers are telling the truth.
  • Radical thought, I am pro covering the wheels on future productions cars. I don't care if does not look as cool, I like nice alloys sure but I also like my wallet. I would rather compromise on little things like that than have to make great sacrifices in other areas honestly like internal cabin volume to maintain a profile. Dude by the way you are by far one the most informative engineering channels going. your targeted approach to the subject and the way you break down fundamentals for demonstration purposes to make your point is a godsend honestly. Like iv used a lot of your work over the last few years as a baseline reference for research and projects and yeah you have saved me many headaches so thankyou.
  • @Ryanstuff
    I actually like partially covered rear wheels. I think it looks futuristic and I'm all about the efficiency it provides.
  • @CjqNslXUcM
    I'm impressed by the project and I love the adjusting diffuser. I have the feeling that they've done a lot to the underside of the car.
  • I love the penguin comparison, it really puts into perspective how impressive cars are becoming in the effeciency aspect! I personally think the front of the EQS and the rear of the EQAA would be a fantastic looking mix!
  • Another great video! Especially highlighting that future gains are minimal. This is a key teaching in engineering optimization and not always obvious to outsiders.
  • Covered back wheels look great, just check your classic Citroëns: the DS, SM and CX (named after the French term for Cd). Mercedes just were afraid people would say their car looks like a Citroën again after a lot of people noticed how much the EQS looks likes the Citroën C6. I also remember the EQXX having experimental shock absorbers for extra efficiency? I am curious if the Lightyear Zero and Aptera can get close to the EQXX.
  • @halo3dg
    The drag coefficient of the penguin being brought up made me laugh and every time it was mentioned afterwards just made me laugh harder! Love the small things like this haha