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This photo provided by Kia shows the Carnival minivan, which is now available as a fuel-efficient hybrid. (Courtesy of Kia America via AP)

This photo provided by Kia shows the Carnival minivan, which is now available as a fuel-efficient hybrid. (Courtesy of Kia America via AP)

This photo provided by Toyota shows the Sienna minivan, which is available exclusively as a fuel-efficient hybrid. (Courtesy of Toyota Motor Sales U.S.A. via AP)

This photo provided by Toyota shows the Sienna minivan, which is available exclusively as a fuel-efficient hybrid. (Courtesy of Toyota Motor Sales U.S.A. via AP)