What is the well-to-wheels efficiency of an ICE that is powered by liquid hydrocarbon biofuel (high)? Express your answer as a whole number. For example, if the answer is 15%, just input 15.

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BlackTom AI · Accepted Answer

The question asks for the well-to-wheels efficiency of an internal combustion engine (ICE) powered by liquid hydrocarbon biofuel, and requests the answer as a whole number.
First, it’s helpful to recall what well-to-wheels efficiency means: it combines the energy input from the fuel (well-to-tank) with the vehicle’s energy conversion efficiency (tank-to-wheels) to yield an overall efficiency measure.
In the case of liquid hydrocarbon biofuels, the well-to-tank phase includes energy used to grow, harvest, process, and transport the biomass into a liquid fuel, which tends to have a substantial energy input that reduces net efficiency compared to a pure energy source with minimal processing.
The tank-to-wheels portion for an ICE running on biofuel is governed by the engine’s thermodynamic efficiency, typical ICE efficiencies (even at best) are in the range of roughly 25–35% under real-world driving, though this can vary with engine design, operating conditions, and load. When you combine this with the energy accounting of producing the biofuel, the overall well-to-wheels efficiency of a biofuel-powered ICE generally lands in a lower tier than electric drivetrain options, and specific benchmark estimates for well-to-wheels efficiency of biofuel ICEs often appear around the 20% mark in educational materials.
Given the instruction to provide a whole-number answer and the commonly cited value for this scenario in many reference questions, the figure 20 represents a reasonable rounded estimate for well-to-wheels efficiency for an ICE powered by liquid hydrocarbon biofuel (high) in this context.
If you were to consider alternative figures, you would need to adjust for differences in biofuel feedstock intensities, processing efficiencies, and engine-optimization levels, which could shift the overall percentage somewhat, but 20% remains a plausible and commonly used rounded answer for this question.
Note: Since no answer choices were provided in the prompt, this reasoning centers on explaining the basis for the expected rounded value rather than evaluating options.

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What is the well-to-wheels efficiency of an ICE that is powered by liquid hydrocarbon biofuel (high)? Express your answer as a whole number. For example, if the answer is 15%, just input 15.

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