The term Tank-to-Wheel (TTW) refers to a subrange in the energy chain of a vehicle that extends from the point at which energy is absorbed (charging point; fuel pump) to discharge (being on the move). TTW thus describes the use of fuel in the vehicle and emissions during driving, while the term Well-to-Tank (WTT) describes the subrange of fuel supply – from production of the energy source (petrol, diesel, electricity, natural gas) to fuel supply (transport to the charging point or fuel pump). On the other hand, in the era of e-mobility and decarbonization, a holistic approach is increasingly favoured which covers the entire energy consumption and all greenhouse gas emissions of a fuel caused by production, supply and use. The generic term that subsumes Tank-to-Wheel and Well-to-Tank is Well-to-Wheel (WTW).
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