The writer's comment that he is "guilty as charged" is more telling than he knows. He doesn't provide any info to see if he had a problem or not.
1. What was the state of charge of the batteries? If it was over 30%, the charging drops fairly quick at that point in Tesla and other EV's.
From the article:
"Mustang Mach-E Premium AWD — with 60 miles of remaining range "
That would be 22%, 60 miles out of 270 miles.
2. What was the batteries temp? Cold battery will charge significantly slower and it can take a lot of driving in cold weather to warm up a battery.
Again from the article:
"Target store in Clifton, N.J., on a miserable, rainy night in December."
He was driving, so I assume the battery was not cold. The temperature in December were in the mid 40's to low 50's. I live in the Tri State area on Long Island and the weather here though yesterday, except for December 17 when it snowed, has been unseasonable mild. We have even been playing golf!
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Author notes car is charging at 74kWh rate which you would see around 30% of charge. This would be the full charging rate for a 150kW charger and a 40%+ state of charge battery.
As noted above the battery had a 22%
I have no idea what this all means with regard to charging rates, but going back to the article some of the questions you raised, the answers are there.
My gut tells me that if the car was a Tesla and the driver went to a Tesla super station, in 20 minutes or less he would have left with an 80% charge.