How Can I Improve Fuel Economy for My Fleet?

Most fleets focus on fuel cards and contracts. The two biggest levers for OTR fuel savings are dynamic fuel planning and driver behavior, and most fleets are only using one of them.

If you're a fleet owner or operations manager searching for ways to improve fuel economy, you've probably already done the obvious things: negotiated fuel contracts, issued fuel cards, maybe set a policy about idling. And you're still staring at a fuel line item that feels too large.

That's because the two highest-impact levers for fleet fuel savings are rarely the ones that get the most attention.

The Biggest Misconception: Fuel Cards Are Enough

Fuel cards are useful. They provide transaction visibility, network discounts, and fraud controls. But they don't tell your driver which station to stop at or how much to buy. That decision gets left to the driver, who's making it under schedule pressure at mile 600 of a run.

Within a single contracted network, station prices commonly vary $0.18–$0.31 per gallon on the same day. Fuel cards give you access to the network. They don't tell you where the cheap end of that spread is on today's route.

The card is the contract. The optimization is what turns the contract into actual savings.

The Behavior That's Quietly Costing You

The second most common misconception: "We don't have a plan, but our drivers know what they're doing."

Experienced drivers do know the roads. They know the lots with good parking. They know which TA has a decent restaurant. What they don't know (and can't know without a system behind them) is today's contracted price at every station on their corridor, or how filling up at mile 280 instead of mile 310 affects the total route cost.

No individual driver can hold that calculation in their head. It requires a computer running against a live pricing database. Expecting human intuition to substitute is where most fleets silently lose 10–15% of their fuel budget every year.

The Eight-Year Static Rule

One of the most expensive habits in fleet fuel management is the static fuel stop. A fleet that established its "usual stops" eight years ago and hasn't revisited them is paying today's prices at stations that may no longer be the best option on their corridors, and missing contracted discounts at newer stations that have opened since.

Fuel pricing is not static. Routes change. Networks expand. State diesel tax rates shift. A stop that was optimal in 2017 may be the most expensive option on that corridor today. The only way to know is to run the math on current data, on every route, every time.

Variables Most Fleets Forget

IFTA tax arbitrage: State diesel taxes vary by more than $0.40/gallon between some adjacent states. If your route crosses a state line, how much you fill up on each side of that line can meaningfully change your net fuel cost, even if the pump price looks identical. This is a lever that most dispatchers don't have the bandwidth to calculate manually, but a fuel optimizer handles automatically.

Gallons-per-stop optimization: Stopping at six stations and buying 30 gallons each is almost never the right answer. The optimizer doesn't just pick stations. It tells you exactly how many gallons to buy at each one. That's how you consistently land at the cheapest stations without running low mid-route.

Price Movement Cadence

Contracted station prices update on cycles that vary by network, some daily, some weekly. A fuel plan built Monday morning may be meaningfully stale by Wednesday afternoon on a volatile week. Fleets that rely on a price snapshot from their last pricing file upload are working with data that has an expiration date they're probably not tracking.

This is why fuel plans need to be generated at dispatch time, against current pricing, not assembled once and reused until someone notices the numbers look wrong.

Driver Buy-In: Carrot vs. Stick

Trying to improve fuel economy through enforcement (write-ups, warnings, docked pay) has a predictable outcome: short-term compliance followed by resentment and turnover. In a market where experienced drivers are already hard to find, punitive fuel programs are expensive in ways that don't show up on the fuel line.

The durable approach is making the right stop the easy stop. When drivers receive a simple, specific instruction ("Stop at Love's #312 in Amarillo, take 85 gallons") as part of their normal dispatch communication, compliance rates go up without any enforcement conversation. The plan has to be frictionless or it won't be followed.

The carrot side of this equation is underused. Fleets that share per-driver fuel savings with the driver (even informally) see measurably better compliance than those that say nothing. Knowing that a run saved $340 in fuel is motivating in a way that a policy document never is. Some fleets tie small bonuses to fuel efficiency milestones; most find that visibility alone moves behavior.

Driver Behavior: The Other Half of the Equation

Dynamic fuel planning addresses where you buy fuel and how much. Driver behavior addresses how efficiently your truck burns what's in the tank. Both matter. Most fleets focus on one.

The behaviors with the highest fuel impact in OTR trucking:

• Highway speed: Fuel consumption increases roughly 0.1 MPG for each mph over 60. A driver running 70 instead of 65 costs about 0.5 MPG, roughly 8% of total fuel economy on a Class 8 truck.
• Idle time: A diesel engine idling burns approximately 0.8 gallons per hour. Ten hours of unnecessary idle per week is 8 gallons gone with zero freight moved.
• Cruise control discipline: Drivers who use cruise control consistently on flat highways burn 5–7% less fuel than those who don't, all else equal.
• Following distance: Tailgating forces more braking and more acceleration, both of which hurt fuel economy. Professional drivers with 4–6 second following distances consistently post better MPG numbers than aggressive drivers.

The CPM Lens: Why Cents-Per-Mile Is the Right Metric

MPG is a useful number but it hides context. A truck pulling a heavier load or running more miles will post worse MPG even if the driver is doing everything right. The metric that actually tells you whether fuel efficiency is improving is cents per mile (CPM), total fuel cost divided by miles driven.

Tracking CPM by driver, by route, and by month gives you a number you can actually manage. A driver whose CPM is trending up on the same route is showing you something. A route whose CPM is 15% above fleet average is telling you something. MPG alone doesn't give you that resolution.

Stack the Two Big Levers

The fleets achieving 16–32% total fuel cost reduction are typically doing both things simultaneously:

The misconception is that these require major capital investment or a fleet technology overhaul. Dynamic fuel planning can start with your existing contracts and routes. Driver behavior programs start with data you're already generating from your ELD provider.

Where to Start This Week

If you're looking at your fuel spend and trying to figure out where to begin, the answer is almost always the same: run your actual routes through a fuel optimizer using your actual contracted pricing and see what the plan says your trucks should have spent versus what they actually spent.

That gap (between what the math says is possible and what's actually landing in your fuel receipts) is your starting point. Everything else follows from knowing that number.