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A good tune up is an excellent start. One of the first mods you can do is increase your tire pressure to the sidewall max. This means better coasting and overall energy needed to maintain speed, and it is free!
Personally, I would make a plan of what you would like to do to your Opel. I'd start with the easier, cheapest mods (partial grill block, air dam) first and drive for some time to gather info on their effectiveness. Then progress into the more complex mods (kill switch for EOC, accessory deletes) and finally your all-out, crazy mods for ultimate economy (full boat tail, custom tuning, etc.).
Above all else, make it a priority to get some type of fuel economy gauge such as a ScanGauge, UltraGauge, SuperMID, MPGuino, etc. This will help you fine tune every aspect of your driving, as you can see exactly the effect your input is having on your mpgs.
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