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Declare your independence from foreign oil and unleash the power of ethanol!

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Flex Fuel U.S. featured in Business Week as one of America's Most Promising Startups!

View the CertificateNEW: Flex Fuel U. S. awarded EPA Certification for 05-06 Crown Victoria / Lincoln Town Car!

Previously: EPA Certification for '05 & '06 Dodge Charger, Magnum SRT-8 and Chrysler 300 all with 6.1L & 5.7L Hemi engines for passenger and fleet models (view the certificate).

On March 25th of this year we were awarded U.S. patent no: 7,349,790 for the Flex Box Smart Kit.

FLEX-BOX SMART KIT™ is an easy-to-install system that lets you operate your vehicle on any combination of ethanol and gasoline. So you can fill up on E85 (which is a premixed blend of 85% ethanol and 15% gasoline), E20, E10 or pure gasoline. There’s nothing to set, nothing to adjust. FLEX-BOX SMART KIT™ does it all!

FLEX-BOX SMART KIT™ will be available for many current-production and older cars and trucks and high-performance racing engines. And since FLEX-BOX SMART KIT™ is EPA-certified, your vehicle’s warranty isn’t affected.

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FLEX-BOX SMART KIT™ is a compact unit that mounts in your engine compartment. It continuously monitors your engine’s emissions, then delivers supplementary fuel injection to allow your vehicle to operate at optimal performance — no matter what fuel blend is in the tank.

With FLEX-BOX SMART KIT™, you can choose your fuel based on performance, price, availability or your interest in caring for the environment and reducing dependence on foreign oil. FLEX-BOX SMART KIT™ gives you freedom of choice!