Get onboard with a better driving experience: improved performance and 5-20% fuel savings.

With the average cost of new trucks pushing $150,000, and the average cost of old trucks under $30,000, upgrade your well-running older rigs for big profits.

No other alternative fuel solution delivers this much benefit for all class 8 trucks at such a low cost, keeping the convenience and reliability of diesel.

Features of the X-1 Onboard Optimizing Mini-Refinery

Performance Enhancements

  • Ultra-refines diesel and biodiesel blends
  • Increases horsepower and torque
  • Improves progressive shifting at lower RPMs, with less downshifting on all grades
  • Engine runs quieter, smoother, and stronger
  • Lowers engine operating temperatures, with less fan clutch engagement
  • Emulsifies chemical additives, paraffin, and entrained and free water, providing a superior fuel that burns more evenly and completely
  • Reduces strain on HPCR systems—reducing injector clogging with a cleaner fuel
  • Cleans engine while driving
  • No modification to diesel engine required—easily connects to fuel lines and 12VDC
  • Installs quickly with basic mechanical skills
  • Risk-free 2-year warranty and 60-day, money-back guarantee

Economic Benefits

  • Over 750,000 miles of real world testing confirms 5-20% savings
  • Pays for itself in 8-12 months
  • Financing options available for immediate positive cash flow
  • Increases your fleet's competitiveness
  • Easily transfers to your next vehicle for continued payback
  • Engineered for the long haul: built to DOT and Class 8 OEM standards
  • Virtually maintenance free; minimal staff retraining
  • With mounting brackets weighs only 130 lbs.

Environmental Advantages

  • Meet corporate sustainability goals and objectives with reduced emissions
  • Enhanced combustion reduces soot and particulates, resulting in fewer regen cycles
  • Dyno test certified up to 14.23% reduction in NOx emissions


Rugged & Road-Tested — Tried & True

Over 750,000 miles of monitored road miles over 7 years.

The X-1 fuel optimizer has proven to be virtually maintenance free with trouble-free operation for many years.

Limited Supplies

Don’t wait. Call FFS today for a quote.

The X-1 system uses the power of cavitation to re-refine and homogenize your fuel, to include emulsification of entrained and free water. Click here to learn more about how these processes “do their magic.”

The X-1 is easy to understand, easy to install, and easy to operate. Requires no driver interaction. Just “set and forget” and watch your savings grow.

Calculate your truck or fleet's potential savings 


Contact FFS while supplies are still available


Economic Benefits

Fuel savings of 5-20%

Proper use of the X-1 onboard fuel optimizer will achieve consistent savings of 5-20%! No other single product provides such an impressive mileage improvement along with significantly enhanced performance, reduced emissions, and the convenience of diesel fuel.

No other fuel efficiency system delivers a lifetime of savings with this much performance and peace of mind


There are many aftermarket retrofit designs currently being sold as fuel saving devices. Some have negligible or possibly harmful effects on fuel efficiency.

Other fuel savings technologies, such as power for idle reduction, improved aerodynamics, automatic tire inflation, single wide-base tires, and lighter-weight components produce minor incremental improvements that can take years to pay for themselves.

X-1 savings are the direct result of consistently delivering better fuel to your engine, resulting in more even and complete combustion. As a result, less fuel in consumed to do the same task. It’s just that simple!


  • Older trucks remain competitive longer
  • Less risk of HPCR pump failure
  • Climb grades faster when needed/desired
  • Better driving experience–less driver turnover
  • Oil and oil and fuel filters remain serviceable longer
  • Reduced injector clogging
  • Less downtime from faulty EGR or DPF cleaning
  • Cleaner oil–less wear & tear–longer engine life
  • Fewer regen cycles and less DEF fluid consumed
  • Eliminate algaecide and additive use

FFS's fuel efficiency solutions deliver impressive savings from the day of installation

Fierce Fuel Systems is dedicated to putting your hard earned $ in your bank, not in your tank.

© 2021 Fierce Fuel Systems