Taxiing accounts for more than 1/8 of fuel consumption [slides] [pdf]
flight.nasa.gov
flight.nasa.gov
> 25% of the emissions are produced during the Landing Take-Off (LTO) cycle (for flights over a 800km range)
and
> Taxi operations are the largest source of emissions in a standard LTO cycle
It seems almost unbelievable, but the sources seem solid. I would love to hear other input on this.