A few notes, especially on the switching from 93 (or 91) to e30.
-Gauges are nice. Innovate makes a nice one. Keep in mind that you will need some extra fittings to make everything work. I believe the sensors have 3/8" fuel fittings and our cars have 5/16" (I haven't actually checked this, but the 2.0 eco is 5/16" and the 2.3s have a 3/8" so it would only make sense). This kit is also a good bet
http://www.fuel-it.biz/flex-fuel-sensor-with-bluetooth-analyzer/
The wiring should be a little easier on this and the Bluetooth function is awesome.
-If your not running a gauge I would at least check the ethanol content of the station youll be using. This kit is cheap and quick.
http://www.fuel-it.biz/ethanol-content-tester/
-When your switching fuels, remember that the fuel in your lines will still be 93/e10 until the mixed fuel gets into the lines. If you load the tune at the gas station, wait a little bit before you get on it. If you monitor your AP, look at STFT. Right when you switch it will be pretty far negative (I saw negative 15-20%) and it will slowly get closer to zero as the mix hits the motor. I would wait until its at least under -10%, ideally -5%.
-With hybrids and big turbos without AUX fuel, you can reach the limit of the fuel system. Before doing multiple pulls to redline, review a WOT log to make sure you aren't running lean. Stock turbo should not run into this issue, but still worthwhile to check logs before going hard on it.