I have owned mine, a 250 AMG Line since June 2021 and now have just over 15000 miles on it. Just had the first service £274. I use D-Auto and have found when I drive around town or normal roads and drive normally, i.e. lifting off when indicated instead of foot hard down all the time, I get pretty much what the estimate says, around 260. On motorways (most of my driving, always at the speed limit, mainly on cruise control) I get around 20 miles less i.e. around 240 miles. Note that this then affects the estimate next charge. Over winter when it was less than 10 outside it dropped down to around 220, minimum 211. (Car always garaged overnight) I have always driven it the same as if it was an ICE car. On a recent trip to Germany did 100mph (limited by the car) on the autobahn for an extended period and the range dropped off quite quickly, but still would have achieved 180 miles. I always charge to 100% and had a max estimated of 283 miles last summer. Recently tried Hypermiling as an exercise and got over 3.5 mpkwh average and actually gained 6 miles over the start estimate.
Still haven't worked out what the Bonus Miles number on the Display relates to as it has never corresponded to anything else.
Really happy with the car, just wish I had got a fully loaded Premium Plus, (no longer available), as I miss things I have had on previous cars such as Adaptive Cruise, 360 camera, electric memory seats and keyless entry.
Incidentally my trip to Germany was 3000km, around 1875 miles, On Eurotunnel via Nantes to Ravensburg, used the Satnav to plan Mercedes Me rapid chargers, mainly Ionity, and the total charging bill came to 140 euros, £122.