- GreaseCar.com
 - Offers conversion kits to run diesel cars on clean or dirty oils. - IMPCO Technologies
- Designs, manufactures, and markets equipment that allows internal combustion engines to operate on alternative fuels, primarily propane and natural gas.
- Quantum Technologies Worldwide
- Designs, manufactures, and supplies integrated fuel systems to OEMs of fuel cell applications and alternative fuel vehicles.
- Lovecraft Biofuels
- Does conversions using a single tank system that allows you to mix new or waste vegetable oil, diesel, and/or bio-diesel in any combination using the original fuel tank in your car, truck, SUV, or van.
- ECO Fuel Systems Inc.
- Manufacturer and supplier of alternative fuel conversion equipment for the automotive industry.
- Environmental Vehicle Outfitters
- Designs and installs alternative fuel systems for fleet and consumer cars, SUVs, and trucks.
- Gas Water Secret
- Run your car with water using this guide to convert yourgas engine into a cleaner burning water-burning hybrid.
- TN Hybrids
- TN Hybrids offers fuel saving HHO Hybrid kits for any car or truck - gas, diesel, bio-diesel.
- WVO Conversion Designs and Equipment
- Open forum for sharing designs of WVO (waste vegetable oil) conversions and equipment. Sale of custom WVO items including a WVO centrifuge.
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