You're on fire and you want to start running performance numbers? If the runway is over 6500', I'm using it! Falp 40, full reverse and max brakes, you'll fit (unless contamination or ac system failures are an issue). A fire is no time for PIOSEE/GRADE or whatever other PC conference/handholding the company likes. A fire should result in a landing in minutes, just the time taken to manouver the aircraft.