EGKK I see that you're looking at fuel conservation here, and the first thought that came to mind is about the fuel used during taxi, from what I recall a tad more that 23kg!
There must be a way to save fuel during taxi (tugs mentioned before but you gotta balance the cost of tug, tug production and tug use etc) oh and apparently a conveyor belt MAY save you space but the conveyor would use fuel to get it running too.
SB