For older European vehicles, Ship or Sell checks the NHTSA 25-year age path and the EPA 21+ year path before comparing purchase price, true transport cost and U.S. comparable-market context. The NHTSA 25-year period runs from date of manufacture; EPA says the 21+ year path depends on original-equivalent engine configuration.
Purchase price, shipping-provider quote, duty/tariff, insurance, compliance, port/customs, inland delivery, registration and temporary mobility are separate lines. That makes the landed-cost estimate auditable instead of hiding everything behind one number.
Vehicles under 25 years old that were not originally manufactured and certified to applicable FMVSS generally need a NHTSA eligibility / Registered Importer path for permanent import. Vehicles at least 25 years old can use the NHTSA age path, measured from manufacture date. EPA separately describes a 21+ year provision tied to the original engine model/configuration.