Alt-fuel basics

Plain-language overviews of the alternative fuels OpenFuel tracks, including environmental impact vs. their fossil counterparts. Every numerical claim is sourced.

• R99 Renewable Diesel — Drop-in replacement for petroleum diesel made from waste fats and oils — no engine changes required.
• E85 Flex Fuel — A high-octane gasoline–ethanol blend (51–83% ethanol) for flex-fuel vehicles, with meaningful lifecycle GHG benefits.
• Biodiesel (B20, B99, B100) — Fatty acid methyl ester (FAME) blended with petroleum diesel; lifecycle benefits scale with blend ratio.

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