I've known several with 200k+ Miatas on the original motor and gearbox. I personally drove one belonging to a friend that had 220k and still ran great. They are very reliable little cars, and probably the most intelligent choice for your wife that you have asked about thus far.  Also by far the best to drive.
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‘07 Mazda RX8
Past: 911T, 911SC, Carrera, 951s, 955, 996s, 987s, 986s, 997s, BMW 5x, C36, C63, XJR, S8, Maserati Coupe, GT500, etc
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