Recently I’ve been out of luck trying to find a source of Oil, but I do find large amounts of Oil Shale. Thus a problem appears: Coke Ovens are sooooooo slow.
To be specific, I think the main issue is not necessarily the basic speed being slow, but the lack of upgrading options. Most machines in GT supports tier-based overclocking, and also the option of providing more energy (as close to current tier maximum as achievable) for more speed. Coke Oven supports neither.
While some may argue that Coke Ovens are meant for early game, I don’t think that’s entirely the case. They’re essential for making good use of those vast amounts of Oil Shale. They also give a nice x2 bonus for Coals, which combined with Fluidized Bed makes a good source of HU with nice complexity&reward, if not for the scalability issue arising from such slow Coke Ovens.
If I did the maths correctly, to support a Distillation Tower running at full speed, ~28 Coke Ovens are needed.