DROVE 2007 RX350 APPROXIMATELY 15 MINUTES AND RETURNED TO RESIDENCE. 3 MINUTES LATER, WALKED OUTSIDE AND CAR WAS SMOKING FROM ENGINE AREA. WITHIN A MATTER OF 60-90 SECONDS THE CAR WAS COMPLETELY ENGULFED IN FLAMES AND FIRE DEPARTMENT IMMEDIATELY CALLED. FD ARRIVED 21 MINUTES LATER AND CAR WAS STILL FULLY IN FLAMES. ONCE FD EXTINGUISHED FLAMES, CAR WAS A TOTAL LOSS.