Overall, all four companies showed a general decrease in production time over the period. Toyota and Honda consistently had the lowest production times, while Ford and General Motors started with higher values and showed more fluctuations.
In 1998, General Motors had the highest production time at about 32 hours per vehicle, followed by Ford at around 28 hours. In contrast, Toyota and Honda were more efficient, producing vehicles in approximately 21 and 20 hours, respectively.
Between 1998 and 2001, Ford’s production time increased, peaking at around 31 hours in 2001, before steadily declining to just above 20 hours by 2005. General Motors, although starting with the highest time, showed a steady decrease over the years, reaching close to 21 hours by the end of the period.
Toyota and Honda maintained the most efficient production processes throughout the timeline. Their production times remained relatively stable, gradually declining to about 20 hours by 2005, making them the most consistent performers.
In conclusion, although all manufacturers improved efficiency over time, Toyota and Honda were consistently the fastest, while Ford and General Motors had more room for improvement.