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A bit more modest than your numbers, at around 700mi per month since I only commute 3days/wk; and have spent 2mos on Business Travel and vacations. But, never miss an opportunity to drive it!
My 14, and now my 18 are about the same, most months its between 100-400 miles. However one or two months a year it sees 1500~2000 miles when we use it to take a trip.
My 14 had 18,250 miles on it in 51 months. My 18 has 4870 on it in 9 months. Two trips to New Orleans in it this year.
About 600 to 700 per month from April to September - then zero from October to March due to winter storage.
I stretch mine a few more weeks depending on how Michigan weather treats the natives. I can usually get away with driving in October, and maybe a farewell tour for a week or two in November. That being said, I'm around 400 with the two years I've had my Grand Sport if we're talking "active" months. Though I've driven the car almost 3500 miles in 2018 compared to 1300 in 2017.