Dyed (Red) Diesel
Red-Dyed diesel – Most dyed diesel sold in the U.S. is red in color – dyed with the chemical additive Solvent Red 26 or 164. Red-dyed gas may only be used in off-road vehicles and applications, including farm tractors, heavy construction equipment, and generators.
Unleaded Gasonline
Unleaded gas is literally gas without any lead in it. As common a term as it may be, this was not always the case. Tetraethyl lead was introduced into gasoline in the 1920's, primarily to reduce engine knock and improve fuel octane levels and efficiency.
Clear Diesel
Clear diesel – Clear diesel is an on-road vehicle-grade fuel that is available for sale at gas stations throughout the U.S. Any diesel-powered vehicle licensed for on-road use must use this fuel. Clear diesel has a low sulfur content and is legally taxable.