The detail information is nice that shows the number of vehicles having a particular firmware version, yet instead of showing absolute numbers, I think it might be more informative to display the detail as a percentage. It becomes easier to determine what percentage of cars actually have the same firmware as you do. You won't have to do the math in your head to figure out if your car is in the most recent updates or not.
Example, instead of show that 55 model X100 cars have a particular version firmware, perhaps show 8%. I would suggest keeping the top "Latest Fleet Update" as numerical values since it refers to the version.
Really nice site and we love the many types of stats you have put into it.
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