How to Set Fuel Efficiency Targets by Vehicle Role?

Why a Single Fleet Wide Fuel Target Fails Mixed Fleets

A highway tractor averaging 7.5 MPG operates in a different context from a service van averaging 18 MPG. One fleet wide average hides both results, making the tractor look inefficient and allowing the van to appear successful without showing whether either vehicle performs well for its assignment.

NACFE's 2024 Fleet Fuel Study reported 7.77 MPG for participating fleets in 2023, compared with a 6.9 MPG national average. See NACFE's Fleet Fuel Study for the broader industry context, but use your own fleet data for decisions.

ATRI's 2026 report put average truck operating cost at a record $2.336 per mile in 2025. Precise targets matter when fuel is part of every mile. The ATRI operating cost report provides useful context for the financial value of better target setting.

Variables That Shift Fuel Efficiency by Role

Duty Cycle and Route Profile

Highway, urban, and mixed routes create different expectations. A tractor spending 70 percent of its drive time on interstates will normally outperform the same model assigned to stop and go delivery. Regional trucks sit between those conditions, while last mile vans lose efficiency through frequent stops and acceleration. Compare route type and stop pattern before comparing drivers or vehicles. The differences described in why fuel use is hard to compare across vehicles show why role based targets are necessary.

Load Weight and Cargo Patterns

Payload affects the energy required to start, climb, and maintain speed. A service van carrying 500 pounds of tools has a different profile from a flatbed hauling 20,000 pounds of materials.

In heavy duty applications, a practical planning estimate is a 1 to 2 percent fuel economy reduction for each additional 100 pounds, although speed, grade, aerodynamics, and acceleration change the result.

Record the conditions that can change a role's expected result:

• Typical payload range
• Trailer or equipment configuration
• Route grade and traffic level
• Seasonal cargo volume

Idle Time by Role

The U.S. Department of Energy uses 0.8 gallons per hour as a default heavy duty diesel idle value. A service truck idling to power tools has a different purpose from a tractor idling at a rest stop. Count productive idle, such as PTO or refrigeration, separately from avoidable idle. The DOE idle fuel assumptions support role specific idle measurements.

How to Build a Fuel Baseline for Each Vehicle Role

Grouping Vehicles by Operational Mission

Start with the work assignment, then use GVWR, fuel type, and model as secondary filters. Useful role groups include:

• Highway long haul
• Regional distribution
• Urban delivery
• Field service
• Construction or jobsite
• Administrative or pool use

The same Class 5 truck might serve field service one month and regional delivery the next. Update the role when the mission changes, or the baseline will measure assignment changes instead of vehicle performance.

Collecting 60 to 90 Days of Clean Data

Clean data means consistent driver assignment, normal seasonal conditions, complete fuel records, reliable mileage, and no major route change. Pair fuel transactions with trip mileage tracking, maintenance records, and vehicle assignments. Remove fuel card errors, odometer corrections, major breakdowns, and unusual emergency work.

Calculating Role Specific Fuel Targets

The Baseline Plus Improvement Method

Calculate the median MPG for each role group across the baseline period. Set the initial target 3 to 5 percent above that median. If regional delivery vans have a median of 14.2 MPG, a 5 percent target is 14.9 MPG, calculated as 14.2 multiplied by 1.05. Median is better than mean because one breakdown or unusual route will not distort the starting point.

Use a fleet reports dashboard to review results by role, vehicle, driver, route, and time period.

Using Performance Tiers Instead of One Number

A target should show what action each result requires. Use the top 25 percent as maintainers, the middle 50 percent as improvement candidates, and the bottom 25 percent as investigation triggers.

These are examples, not prescribed standards. Adjust the bands after review and track gallons per hour for construction vehicles when PTO work makes MPG misleading.

Adjusting Targets for Seasonal and Operational Changes

Targets should move when weather, air conditioning, route density, payload mix, tire condition, or equipment changes. NACFE data and fleet benchmarking commonly show a 2 to 4 percent seasonal shift for the same vehicles and routes. Review targets quarterly, compare the same role with the prior quarter, and document whether the change came from weather, assignment, equipment, or behavior. The fuel trends that signal a maintenance problem can help separate an operational shift from a mechanical issue.

Connecting Fuel Targets to Driver Coaching and Maintenance

Using Target Gaps to Trigger Coaching

The gap between actual and expected performance becomes a coaching measure. A driver who remains 10 percent or more below the role target should receive feedback about idle time, speed, acceleration, braking, or route choices. Driver behavior can account for up to 33 percent of fuel economy variance between vehicles in similar conditions. DOE reports that aggressive driving can lower fuel economy by 15 to 30 percent at highway speeds and 10 to 40 percent in stop and go traffic. Use driver and user management to connect results to a person and assignment.

When Poor Fuel Numbers Point to Maintenance Issues

A vehicle below its investigation trigger may have low tire pressure, a clogged filter, alignment problems, or a sensor fault. Check the vehicle service history before assuming the driver caused the gap.

Then review whether the vehicle was following its preventive maintenance schedules and whether any service was delayed.

Use this investigation workflow:

1. Identify the gap: Confirm the vehicle is below its role trigger.
2. Check maintenance records: Review service, inspection, tire, and repair history.
3. Check driver data: If maintenance is current, review idle, speed, acceleration, and braking.
4. Schedule inspection: If driver data is normal, arrange diagnostic inspection.
5. Update the baseline: Recalculate after enough clean data exists following resolution.

What Fuel Targets Look Like Across Common Fleet Roles

Reference ranges help managers sense check results, but they should not replace local data:

• Highway tractors, Class 8: 6.5 to 8.5 MPG.
• Regional delivery trucks, Class 5 to 7: 8 to 14 MPG.
• Service vans and light duty vehicles: 15 to 25 MPG.
• Construction and jobsite vehicles: gallons per hour may be better than MPG when PTO use is significant.

NACFE reports that current model year trucks in its study can reach 8.0 to 9.5 MPG in suitable conditions.

A 2026 aspiration above 7.0 MPG for medium duty trucks can provide a comparison point, but each fleet should derive its target from actual work, payload, and route data. What fleet managers miss in fuel reports explains why a top line average can hide the cause of a result.

Reviewing and Resetting Targets Over Time

Use three review levels:

• Monthly spot checks to catch sudden gaps.
• Quarterly formal reviews to adjust targets and performance tiers.
• Annual resets for replacement vehicles, new routes, new drivers, and major fuel price changes.

In AUTOsist, fuel records, vehicle records, reports, and maintenance scheduling can be reviewed together so a target change leads to action. The goal is not to force every vehicle toward one number. It is to make each role's expectation fair, visible, and financially useful.