Well, awesome! Have you ever tried weighing you're 14" steelies? Or do you have daises or something?
A hard top may be a good addition for aero, but I can't be sure.
I'd look into aluminum ones, there is a 7-spoke hollow spoke design that is one of the lightest out there. you can find these by noticing on the back of the spoke there is material taken off, making a spoon shape on the inside.
You could switch your 5speed for a more fuel-friendly 6speed, which also has a better power holding capacity. The 6's can be temperamental, but the close ratios are good. I average about 28-30mpg in my Mazdaspeed, and my personal best was 32mpg. Thats per tank. I drove 57miles one way to work every day, and only 2 miles city each way. So with 4 miles city, 114miles hwy, I had a good opportunity for mileage.
Do you know what rear end ratio you have? The lowest I know of is a 3.90 that is easily available.
You can also remove a ton of weight from a miata, and it is well documented in many sites. I notice you have a great year, the 93, which means you buck the 89-90-91's crank problem, but keep one of the lightest years and smallest engines avail, the 89-93. The 1990's dash is almost 10lbs lighter, so you could swap that in for some savings... Actually, read Keiths article on his car, he did some amazing lightening.
Targa Miata
and there is this fellow too, a very smart man.
Red Beast - Lightweight Miata
the main focus sites for miata's are Miata.net and miataturbo.net, with clubroadster.net being a bit more of a visual mod site.
Anyway, I'm getting carried away, good luck!
Oh, well my project right now is an underpan for my car to improve top end speed, acceleration, and as a bonus, mpg. I would also like autokonexion's kamback style roof, but its much too much money. Good luck! AGAIN!
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There is a wealth of information in the 100+ driving tips... but I can tell you right now the #1 thing you could do. If you are anything like I was before I started hypermiling, I loved that low-level torque that that light little miata undoubtedly has - I used to have a subaru impreza, and that thing took off. Stop that. You don't necessarily have to start accelerating slower(you'll have to eventually), but I found the best way to save gas was to shift at the LOWEST possible RPM your car can handle without rattling itself to death (stalling). I shift at about 1800rpms, but start off doing it at 2000 maybe... it takes a little skill to walk that line. Hopefully doing this if you don't already will significantly improve your mileage. Oh, and try going the speed limit on the highway. I was surprised at how better my mileage got when I actually obeyed the speed limit (now I go 55-60 on highways even)
