EK is now asking crews to consider using only idle reverse if situations allow.
My very basic calculations would be something like this.
At max reverse I assumed a fuel flow of around 3000 - 4000kgs/hour.
Using 4T/hr = 4000kgs/60secs. Average reverse time about 20secs which would equate to 22kgs per engine, so around 40kgs for each landing. Not a lot but as Screwballs calculated over a period of time the costs add up.
Figures for the B777.
Oz