U.S. Clean Fuel Tax Deductions
You are allowed a limited deduction for the cost of clean-fuel vehicle property and clean-fuel vehicle refueling property you place in service during the tax year.
The following are clean-burning fuels:
Liquefied Natural Gas
Liquefied Petroleum Gas
Any other fuel that is at least 85% alcohol (any kind) or ether
Deduction for Clean-Fuel Vehicle Property.
The deduction for this property may be claimed regardless of whether the property is used in a trade or business.
Clean-Fuel Vehicle Property
Clean-Fuel Vehicle Property is either of the following kinds of property.
Any property installed on a motor vehicle (including installation costs) to enable it to be propelled by a clean-burning fuel.
The property is an engine (or modification of an engine) that can use a clean-burning fuel, or The Property is used to store or deliver that fuel to the engine or to exhaust gases from the combustion of that fuel.
For vehicles that may be propelled by both a clean-burning fuel and any other fuel, your deduction is generally the additional cost of permitting the use of the clean-burning fuel.