I was just running some numbers concerning converting my oil power plant into using Turbo Fuel, and with 480 oil/min coming in, I can turn that into 480 Turbofuel/min with the help of 240 Coal and 240 Sulfur/min.
Now, coal seems to be abundant enough for this to be reasonable, but the nearest place I can get that much sulfur is like a third of the entire map away. Sulfur is just not very abundant.
Main Point: I don't think it would need to be a huge reduction, maybe to like 20 Sulfur/min instead of 30 (to make 30 Compacted Coal/min), or 22.5/min. At most, down by half to 15/min.
Side note, 240 Sulfur/min is maybe a bit much, but 64 fuel generators and 9,600 MW of power is too good of an opportunity to pass up :D
What do y'all think?