Welcome to GS! Your manual transmission will help you alot. If there are still things you can do to change your driving style, that will be the place to start. Right now you have the opportunity to establish a baseline of your car's MPG with driving mods only. Maybe just do the tire PSI for now because it's basically free. While you are doing that, you can study all the mods on this site and pick and choose the ones you want to do.
In terms of the ScanGauge, you can also look on ebay. If you don't mind clunky aesthetics and are patient, you can probably get a ScanGauge I for less money.
ScanGauge I Compared to ScanGauge II
Originally Posted by katman
I would recommend switching all fluids to synthetics. More power, getter drivability especially in the cold, longer coasts, longer life of your car, cheaper since they last longer, better for the ecology.
That sounds like a good idea, especially since tvent has a young car. My car has used dino-oil almost all it's life, so I don't want to change it now.