Comparison of automobile fuel technologies

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Gasoline Ethanol Diesel Biodiesel Hydrogen (internal combustion) Electric Hydrogen (Fuel cells)
Net output for single unit of input 1.3 0.9 × source of electricity 0.17 to 0.85 × source of electricity
Infrastructure needed to be practical none none none none
Current state of development

[edit] Chemicals emitted relative to gasoline

Gasoline Ethanol Diesel Biodiesel Hydrogen (internal combustion) Electric Hydrogen (Fuel cells)
carbon dioxide 100% ≈ 100% 22% Depends on source of electricity Depends on source of electricity Depends on source of electricity
carbon monoxide 100% < 100% 50% Depends on source of electricity Depends on source of electricity Depends on source of electricity
benzofluoranthene 100% 44% Depends on source of electricity Depends on source of electricity Depends on source of electricity
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