US road safety bosses are now alleging that 89 people have died in sudden acceleration crashes involving Toyotas, rather than the 52 previously reported.
America's National Highway Traffic Safety Administration (NHTSA) says the deaths occurred in 71 accidents reported since 2000. Previously, it had put the total number of accidents at 43.
The NHTSA also reported that it has now received 6200 complaints, compared with 2600 when it previously reported in March.
James Lentz, the company's sales president in the US, reiterated that Toyota has examined 2000 vehicles, and found no electronic flaws that would explain the reports of unintended acceleration.
Toyota is one of 11 car makers that have agreed in principle to fit brake-override systems to its cars from next year. It has also agreed to retro-fit seven current models with new software that will act as a brake-override system.