Cummins: Rock-Solid Rules for Fuel Economy


June 26, 2015 by Minuteman Trucks

Understanding Fuel Economy

The importance of fuel economy to the successful operation of a trucking company cannot be understated. Fuel is one of the largest variable costs in a trucking venture, and, while no trucking operation can control the cost of fuel, it has at least some control over the amount or rate of consumption.

The 10 Rock-Solid RulesCumminsMPGGuide_RockSolidRules

  1. Every 2% reduction in aerodynamic drag results in approximately 1% improvement in fuel economy.
  2. Above 55 mph, each 1 mph increase in vehicle speed decreases fuel economy by 0.1 mpg.
  3. Worn tires provide better fuel economy than new tires, up to 7% better fuel economy.
  4. Used lug drive tires can get up to 0.4 mpg better than new lug tires.
  5. Ribbed tires on the drive axles provide 2–4% better fuel economy than lugged tires.
  6. Every 10 psi that a truck’s tires are underinflated reduces fuel economy by 1%.
  7. The break-in period for tires is between 35,000 and 50,000 miles.
  8. Tires make biggest difference in mpg below around 50 mph; aerodynamics is the most important factor over around 50 mph.
  9. The most efficient drivers get about 30% better fuel economy than the least efficient drivers.
  10. Idle time is costly. Every hour of idle time in a long-haul operation can decrease fuel efficiency by 1%.


Want to learn more? Click here to download Cummins MPG Guide: Secrets to Better Fuel Economy


One thought on “Cummins: Rock-Solid Rules for Fuel Economy

  1. Although emissions have been tough on the Diesel engines its great to see better fuel economy! I’m excited to see what Cummins, Isuzu, and other manufacturers will be doing to meet the new standards in 2016.

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