I’d always thought it was a matter of same color (clear/brown/green), crush, melt, recast.
Diesel cost to me is a moot issue as the raw silica would need to be brought in to a production location as well for new glass.
The only real question then is the energy cost of sand clean and melt vs the energy cost of sort, clean, crush, glass melt.
I suppose the cost differential would vary based upon the locations proximity to a natural sand source.
Know of any glass manufacturers in your area??
There are only a few, so all that recycled glass has to be transported across the country. It is also volumetrically light, raw materials are dense and can be carried by railcar very economically. That lightweight recycled glass takes far more energy and fuel to transport than raw materials.
Removing the color and other materials in glass is also often a chemical process, so there’s that pollution and material transport as well.
Recycling glass has a negative economic and environmental affect.