Rightsizing Your Vehicle Fleet to Conserve Fuel

Photo of a vehicle fleet

Fleet rightsizing is a management practice that can help vehicle fleet managers build and maintain sustainable, fuel-efficient fleets. Fleet inventories often grow over time to include vehicles that are highly specialized, rarely used, or unsuitable for current applications. By optimizing fleet size and composition, managers can minimize vehicle use, conserve fuel, and save money.

Evaluate Vehicle Needs and Use

Fleet managers should understand their drivers' daily vehicle use and needs. Most fleet managers already have a handle on vehicle quantities, types, average mileage, payloads, and fuel economy. Fleet rightsizing combines this information with a critical look at fleet operations to identify opportunities for reducing fuel use.

Case Study

The City of Detroit generated $1 million in revenue working with the Clean Energy Coalition to rightsize the city's fleet by selling surplus vehicles and equipment. Learn more about selling vehicles.

A fleet rightsizing strategy should evaluate the business case of each vehicle to determine whether reassigning, replacing, or eliminating the vehicle would reduce petroleum and maintenance costs without compromising fleet activities. Fleet managers often need to define evaluation criteria and rank vehicles to complete this analysis. A fleet dominated by sport utility vehicles, for example, may find that mid-size sedans suffice with a significant reduction in fuel costs.

Fleet managers may develop their own analysis or use existing evaluation tools. The Vehicle Allocation Methodology developed by the U.S. General Services Administration is an evaluation framework that federal agency fleets use to ensure fleets are cost-effective and contain the appropriate number and type of vehicles. Learn more about this methodology in the Comprehensive Federal Fleet Management Handbook.

Make Smart Vehicle Purchases

State and Local Laws

The State of Maine has a law that requires fleets to purchase fuel-efficient vehicles to help state fleets conserve fuel and save money.

The City of Woodbury, Minnesota, has enacted policies designed to rightsize the city’s vehicle fleet by purchasing more efficient vehicles that still meet the fleet's needs.

Fleet managers may decide to replace older vehicles with more fuel-efficient or alternative fuel vehicles. These purchasing strategies may help fleet managers make decisions that meet operational needs and conserve fuel:

  • Transition to Smaller, More-Efficient Engines: Using smaller engines can help fleets meet operational needs without downgrading vehicle class. Some fleets choose to switch from 6-cylinder to 4-cylinder engines to help reduce fuel use and emissions. In many cases, the new, smaller engine can have nearly the same horsepower as the older, larger engine.

  • Choose Lighter Vehicles: When purchasing new vehicles, look for opportunities to reduce vehicle weight. Lightweight materials, such as aluminum frames, and smaller components can improve fuel economy by up to 2% for every 100 pounds of weight reduced. Also try to avoid unnecessarily large body configurations and heavy accessories.

  • Use Alternative Fuels and Vehicles: Alternative fuel and fuel-efficient advanced vehicles can reduce or eliminate petroleum use and can be economical options for many fleets. Cost savings from vehicle maintenance, operation, and fuel use often offset higher purchase prices.

Fleet managers do not need to select just one of the above purchasing strategies. Sometimes the selective blending of strategies can provide the greatest benefit.

Minimize Vehicle Use

In addition to reducing vehicle inventory, fleet rightsizing is about finding creative and strategic ways to reduce vehicle use. Learn about reducing vehicle miles traveled through strategies for transportation system efficiency.

Find light-duty vehicle fuel economy information in the most recent Fuel Economy Guide.