Alternative Fuels Compared: HHO, CNG, LPG, Biodiesel, and Electric

The Alternatives Landscape

Vehicle owners seeking to reduce fuel costs and environmental impact have more options than ever. This comparison evaluates each alternative on cost per mile, infrastructure availability, upfront investment, and practical considerations for the average driver.

HHO Supplementation

• Cost: $150–$300 one-time, minimal ongoing
• Infrastructure: None needed — runs from distilled water
• Fuel savings: 10–25% of existing fuel cost
• Works with: Any gasoline or diesel vehicle
• Best for: Anyone wanting immediate cost reduction with minimal commitment

CNG (Compressed Natural Gas)

• Cost: $6,000–$12,000 conversion
• Infrastructure: Limited nationally, growing
• Fuel savings: 30–50% cost reduction
• Works with: High-mileage vehicles with conversion kit
• Best for: Fleet vehicles, heavy annual mileage, urban/suburban areas near stations

LPG (Liquefied Petroleum Gas)

• Cost: $1,500–$3,500 conversion
• Infrastructure: More widely available than CNG
• Fuel savings: 20–40% cost reduction
• Best for: Rural areas with propane access, fleet vans and trucks

Biodiesel

• Cost: Similar to diesel, sometimes cheaper per GGE
• Infrastructure: Growing, available at many truck stops
• Fuel savings: Variable — cost savings depend on local pricing
• Best for: Diesel owners near B20 or B100 stations

Battery Electric

• Cost: New vehicle purchase typically $35,000+
• Fuel savings: 60–80% fuel cost reduction
• Best for: Short-medium daily commutes with home charging

Hydrogen FCEV

• Cost: $50,000+ vehicle, lease available
• Infrastructure: California-only practical
• Best for: California drivers near H₂ stations