The transport industry is changing rapidly. In the past, we only looked at the number of litres of diesel coming out of the exhaust; now we’re talking about zero-emission driving, hydrogen and electric trucks. You’re increasingly hearing the term ‘well-to-wheel’ in these discussions. But what exactly does this mean for you as a driver or business owner, and why is it much more important than just your truck’s emissions?
The entire chain in view
Well-to-wheel (WTW) is a method for calculating the total energy efficiency and environmental impact of a fuel. Literally translated, it means ‘from source to wheel’. Instead of looking only at what happens in the truck itself (the emissions while driving), this method looks at the entire journey the energy makes before it gets your wheels moving.
This is essential because a truck that is ‘clean’ on paper can still have a negative environmental impact overall if the fuel is produced in a highly polluting way. To get an accurate picture, we divide well-to-wheel into two different phases: well-to-tank and tank-to-wheel.
From the source to the fuel tank
The first step is the well-to-tank phase. This looks at everything that happens before the fuel or electricity reaches your truck. This includes extracting oil, generating electricity or producing hydrogen. Transport to the filling station or charging point is also included.
This process is fairly efficient for diesel, but the source is finite and its extraction is environmentally damaging. For an electric truck, the well-to-tank impact depends entirely on how the electricity is generated. Do you drive on green electricity from wind turbines? Then the score is excellent. But if the electricity is generated at a coal-fired power station, the impact in this phase is much greater.
From the tank to the wheels
The second phase, tank-to-wheel, is the part you deal with every day as a driver. This covers the vehicle’s energy efficiency and the emissions produced while driving. A traditional diesel engine loses a lot of energy as heat, whereas an electric motor converts almost all its energy directly into motion.
The great advantage of electric and hydrogen trucks is that their tank-to-wheel emissions are zero. No harmful substances are released from an exhaust pipe. However, only when you combine this with the first phase do you get the complete well-to-wheel score, which determines how sustainably you are really on the road.
Want to learn more about sustainable transport? Read all about alternative fuels for trucks here.
Why is well-to-wheel important for the transport sector?
The well-to-wheel approach is becoming increasingly important for transport companies due to stricter European regulations, such as the Mobility Package. Customers are increasingly demanding reports on the total CO2 footprint of a transport operation. If you only look at the exhaust, you don’t give an honest answer to the question of how sustainably you operate.
Moreover, understanding this principle helps you make the right investment decisions. Buying an electric truck is a good step, but the real gains are only achieved when the entire chain (the well-to-wheel approach) is in order. This affects not only the environment, but in the long term also taxes, tolls and access to zero-emission zones in city centres.
Ready for the future
Whether you drive on diesel, HVO, electricity or hydrogen, the way we think about fuel has changed for good. By looking beyond the fuel cap, you’re preparing yourself for a sector that places increasing value on transparency and genuine sustainability.
Frequently asked questions about Well-to-Wheel
Is well-to-wheel the same as life-cycle assessment (LCA)?
No, well-to-wheel looks specifically at the fuel chain. An LCA is even more comprehensive and also looks at the production and recycling of the truck itself.
Why do electric trucks often score better on a well-to-wheel basis?
Because electric motors use energy much more efficiently than combustion engines, and electricity is increasingly generated from sustainable sources.
Does well-to-wheel affect my driving licence or Code 95?
Not directly on your driving licence, but knowledge of sustainable and efficient driving is a regular part of Code 95 training because it directly affects business operations.
