With the caveat that this is all more or less on the back of a very small cigarette packet...
Using the Boeing QRH and some basic maths I achieved a rough figure of 21.3 kilograms burned if you touchdown at a groundspeed of 145 knots, using 74% reverse (detent 1) and autobrake 3 to slowdown. That gives you just shy of twenty seconds to get to 60 knots where you would normally go back to idle reverse. All based on a 737NG.
If you use idle reverse, with the reverse adder, to get to the same 60 knot point you would burn circa 8.2 kilograms.
So a difference of 13.1 kilograms. Very rough maths but I would say I can't be out massively! So in my end of the business, 13.1 X 1000 sectors per day = 13.1 tonnes of Jet A-1.
Jet Fuel Price Monitor
Using the above that could be a saving of $17,218 or £8,648 in real money per day.
All of the above based on a pilot's grasp of mathematics and the venerable Boeing 737-700.