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I would start with the simple to free stuff, then work your way up to the most effective mods, front fascia, side skirts, rear diffuser, belly pan, etc. also if you have an android phone look into getting a bluetooth obd2 adapter and some apps for it, ie Efficiency, Torque, Blackbox and OBD, etc. These apps will read your ECM and give you real time values such as engine load, fuel consumption, range, etc.
I am currently working on my 96 VW cabrio and these are the tools i am using for my new research project for Indiana Tech. I am using coroplast (very subtly and stealthily to retain a professional appearance that will interest the school into helping fund my project. This spring i will be receiving approx $11k and ill be buying a poly or fiberglass front fascia based on the audi a3, side skirts and a read diffuser. Also the car will get a new coat of darkish green paint to display the theme.
i guess my point is get the most bang for ur buck before you spend all ur $$ on something that will only yield a 1% or 2% gain.
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