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Fuel use for heavy-duty vehicles in 2030 and 2050. The stacked bars represent fuel use for the scenarios where both demand and efficiency are modified. The dots represent the total fuel use when only efficiency (yellow dots) or demand (blue dots) are changed. E85X represents a fuel blend of ethanol and gasoline such that the ethanol can constitute as much as 85% of the total, Biodieselx represents a blend up to 20% biodiesel.
