In my '99, 80 mph on the interstate is spinning the engine at 4,000 rpm in 5th. Not so good for gas mileage, but awesome for keeping the turbo spooled for passing power :)
^Ditto, but '04 and 6th gear.
http://flyinmiata.com/tech/gearing.php
1999 with stock 15" tires: 4151 rpm at 80
2004 MSM with stock 17" tires: 3962 rpm at 80
1994 with stock 15" wheels: 3947 rpm at 80
1994 Targa Miata: 2002 rpm at 80 
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