ZelkamCatalyzing better diesel performance Free guide for Class 8 fleets

Class 8 Trucking Edition, 2026

The Fleet Fuel Playbook

What actually saves fuel in Class 8 trucking, and what doesn't. Fourteen options compared on savings, cost, payback and where each one works.

Cover of The Fleet Fuel Playbook, Class 8 Trucking Edition
  • Which options fit long-haul, regional and vocational fleets
  • Savings per truck at $4, $5 and $6 diesel, with reported paybacks
  • Five questions to ask before you trust any fuel-saving claim
  • A one-page action plan and payback worksheet

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What's inside

  1. 1
    At a glance: what fits your duty cycleFourteen options rated for long-haul sleeper, regional and vocational fleets.
  2. 2
    What the savings are worthDollars per truck at $4, $5 and $6 diesel, plus reported payback times.
  3. 3
    Before you buy: how to judge a claimFive questions to ask, and why a three-truck pilot can mislead you.
  4. 4
    The options, one by oneIdling, speed, drivers, aero, tires, drivetrain and the fuel itself.
  5. 5
    Stacking measures, and what doesn't workHow savings combine (they don't simply add) and where money gets wasted.
  6. 6
    Alternative fuels and your action planWhere biodiesel and renewable diesel fit, then a checklist and payback worksheet.

Written for the people who pay the fuel bill

Fleet and operations managersEvery option side by side on savings, cost and payback, so you can pick what fits your routes.
Maintenance leadsWhat each option means for tires, oil, idle equipment and your next truck spec.
Sustainability leadsEach gallon saved is 22.4 lb of CO2 avoided. Plus where lower-carbon fuels fit.
Brian Livingston, President of Zelkam

Built on independent data

Every figure comes from independent testing and research, with 23 sources listed at the back, including NACFE, EPA SmartWay, ATRI, ICCT, TMC and the U.S. Energy Information Administration. Compiled by Brian Livingston, President of Zelkam and a chemical engineer with a 40-plus-year engineering career.

Zelkam sells the Rentar Fuel Catalyst, one of the options reviewed in this guide. The organizations cited have not reviewed or endorsed this guide.

Fuel is the cost you can still control.

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