> They never really run out, but eventually you’ll stop running regular trains to an oil depot because your reservoir tanks take hours to fill.
Speed beacons + Speed Modules + Infinite Productivity gets you pretty far.
> Pumpjacks give less oil over time.
Back in 0.13, they dropped to 0.1 oil/second. Today, this minimum has been grossly buffed, greatly reducing the number of depleted pumpjacks you need in endgame. The output is also improved by infinite-productivity research, increasing their output the longer your megabase runs.
There's also Coal Liquefaction, which came a few years after 0.13. That also reduces the need to find new pumpjacks (and again: because coal mines use electric mines, its possible to automate mines with blueprints).
So Coal runs out, but is far easier + automatic to expand compared to oil. So you just turn your coal into oil products.
