Rental car companies are starting to rent EVs, which is great for many rentals. But Hertz and Avis/Budget have a fat fee if you don't return it recharged, and on some rentals that can be a real burden as you can't just "stop by the gas station for 5 minutes on the way to the airport." Though if your hotel has charging, it's even easier to refill than a gas car.

So I examine what all the rental companies do and what the fee means and how they charge the cars in this Forbes.com article.

An annoying paper argues that self-driving cars will use huge amounts of compute and thus have a giant carbon footprint. The boring way that it's wrong is that the compute load will not grow as they suggest.

The more interesting way that it's wrong is that self-driving EVs will draw most of their power from no-emission generation sources like solar and nuclear, even if they do use a lot of power.

Here's a digest of some of my recent postings on Forbes.com

Tesla may add radar back

A filing suggests Tesla may be putting a radar back in their cars, but this time a high resolution radar, which is a bit like the LIDAR they swore was a crutch. It would be a good idea.

Generally it doesn't make sense (and isn't that green) to have off-grid solar compared to grid-tied solar. However, a new company sells a self-contained solar EV charging station for parking lots which they claim is cheaper than on-grid, because you can just get it delivered in one day with no permits, planning, wiring or construction.

It's true that all those factors are now the biggest element of charging and solar installations.

Thanksgiving is back baby. In 2019 a storm caused lines at some EV chargers. Will it repeat this year, and how do you handle the peak demand for long distance road travel?

Read some pre-holiday thoughts at How will EVs handle the Thanksgiving crunch?

Two stories today:

France mandates solar panels on parking lots

France will require all parking lots with over 80 spaces to put in solar panels. That's huge, and means the power will be generated right where cars are charging in the morning -- no grid distribution needed.

France Mandates Solar Panels On Most Parking Lots; A Great Marriage With The EV

In a short interview snippet, Karpathy, who recently stepped down from being director of AI for Tesla, explains their reasoning for taking out radar, ultrasonics, and never using LIDAR or detailed maps.

"The best part is no part" is Elon's philosophy, and it's a valid one, if you are an automaker who wants to lower costs. But is it the right philosophy if you want to be first on the road with a safe robocar?

A press release from Electrify America, the largest non-Tesla charging network, revealed that their average stall is used slightly more than once a day.

I explore what that might be and what it means, with questions about how much people road trip in non-Teslas and the issues with poor reliability of these stations. And I point out ways to improve that reliability, including failing operational at the risk of giving out some free electricity.

Tesla is conducting a vote among owners on where to put new Superchargers. This will identify popular locations, but popularity may not be the only metric to use to decide where fast charging goes. Tesla paved the way by creating chargers not to use in your home town, but so that you would feel confident you could take your EV on long road trips -- something not possible before. The best choices may be small and rural, where people only go rarely, but where they want to feel they could go if they wanted.

Today I attended the launch of the Alef, a new e-VTOL vehicle that drives as well as flies. Most so-called flying cars don't actually drive, and there are reasons for this, but Alef thinks the advantages outweigh the disadvantages.

I've been friends with Alef since 2018, though I have no stock, so here's my report on the issues in their design and launch.

Read Launching the Alef, a try fly-and-drive flying car

With California mandating all new cars be EVs by 2035, and other places doing the same, EV-skeptics argue the power grid can't handle this. This claim appeared again during the recent California heat wave that came close to overloading the California grid over a false report that the state asked EV drivers not to charge their cars. (In reality it just repeated the everyday policy to avoid charging from 4pm to 9pm on high usage days.)

Two recent stories -- about BMW charging a monthly fee to use the heated seats pre-installed in your car, and Tesla replacing a 60kwh battery with a 90kwh under warranty, but forgetting to software limit it to 60kwh, then finally applying the limit after two resales of the car as an (unknowingly accidental) 90 model, have opened up cans of worms about the question of software enabled and disabled features, and whether they are good or bad for the customer or just good for the company.

I have written a guide of useful hints and tricks for doing an EV road trip and barely spending any time charging. I've done over 10,000 miles of EV road trips and you can to, once you get an EV.

Read this at Forbes.com:

All you need for a great EV road trip

I have two other articles on Forbes.com that I didn't publish here in the blog:

Now that we can get good EVs, people are moving to SUVs and trucks, as they did with gasoline. It's better than gasoline of course, and cheaper, but there is a hidden cost in needing all that extra energy, beyond extra cost.

Read about that at Towing a trailer with an F150 Lightning cuts range in half, but that's not the only change

Travel around and you will find EV pricing anywhere from free, to up to 60 cents/kwh, or sometimes by the minute, with session fees, flat fees, idle fees and more.

The problem is that unlike gasoline, electrical energy isn't the product. It's charging that is the service with a bit of product. How does it make sense to price it?

Read more on Forbes.com at EV charging prices are all over the map, how should they price it

I just did my annual maintenance on my Tesla -- adding wiper fluid and putting air in the tires. That's really it. But last year it was different. I had to replace my tires after only 29,000 miles, in part because I mistakenly never rotated them. But there's more to it than just that mistake, so the tires remain a special source of higher maintenance cost you need to worry about.

In my article last week, I outlined how Texas issued grants to build EV charging almost entirely at gas stations, including a chain of mega gas-stations known as Buc-ee's. Buc-ee's may be a great place for gas, but to understand why it may not be right for charging, you have to understand that for gas cars, gas stations are a destination where you get gasoline, and it is nice if they have amenities. For charging to work in its ideal way, you want to have destinations you were going to stop at anyway, which have charging as an amenity, so charging can take nothing from your day.

I went digging in the numbers behind the Texas grants to pay 70% of the cost of installing Fast charging. All the grants went to gas stations (terrible places to spend 40 minutes) and Tesla's applications for its first stations which charge non-Tesla cars (required by grant) didn't make the cut -- even though they came in at only 1/5th of the price per charger of most of the other applications. In this new article, I discuss the issues around this -- what does it mean for Tesla to open up stations, why is Tesla so ridiculously cheaper, why did Texas make such bad choices and more.

It is common to see plans for EV charging which are still bound up in "gasoline thinking" where people treat an EV like a car with a tank you empty and then fill up while empty, waiting. In fact, if you do EV charging right, you always do it while you are doing something else, so it takes zero time from your day.