I set aside almost half of the allowable area for my oil operations to grow. To get to my refineries, I had (5) oil facilities with approx 45 pump jacks going. From there make sure to have 3 or 4 trade depots doing nothing but trading petrol on the global market with a clear drive to the city entrance.
Once I unlocked the refinery, I added (1) refinery, switched a trade depot to hold fuel instead of petrol, and continued that cyclically. I eventually went back down to only 2 trade depots and prob could reduce that further. Currently have (6) refineries with 4 fuel refineries at each and making BANK!
On my server, petrol was selling for 4.5k, plastic @ 11.2k, and fuel @ 21k. The petrol converts 1 to 1 when making fuel or plastic.
(TIP FOR REFINERIES: Once you plop it immediately bulldoze the plastics extension. This way you can add (4) fuel converters to the rear of the facility and keep it compact as we all know how precious space is in this game. The cost of this is quickly recouped with how much FUEL is worth on the global market.)
