I recommend a 1990's era Honda Civic Del Sol. It's a great car and uses almost all the same parts as the Civic's and Accords of the era. It's a little 2 door sports car with a removable hard top, and the manual transmission version is supper fun to drive and gets like 33mpg. I got a 1994 with 89,000 miles on it a few years back for $2500 put another 50,000 miles on it and just sold it for $2500. Best car I have ever owned. I would be willing to bet the true carbon footprint of buying and driving an old del sol for another 100k is less then buying a new tesla and driving it for 100k.
I'm familiar with the Del Sol; I destroyed one's rear end when it stopped short in the middle of an intersection (my car's bumper was scratched) so for practical and safety reasons I recommend the 4-door Civic. But it's impressive that yours never lost value!
If I wanted a fun sporty cheap 2-seater, the only choice for me would be the Mazda MX-5. For $2.5k you can cruise over to the autocross track with the top down, beat a Corvette's lap times, and then cruise home all without breaking 30mpg. (Okay, so maybe you'll need either amazing driving skills or race tires to beat the Corvette, but it's doable ;))
I drove my del Sol for 14 years; most of that time, it was my only vehicle. Fantastic car until it tried to kill me. (Lesson learned: don't ignore noises from the front end.)
