With diesel volatile and margins thin, every fleet is shopping for fuel savings — and five very different kinds of tools all market themselves under that banner. This guide separates them honestly: what each category actually does, who it genuinely fits, and the questions that expose the differences. Yes, we make one of these tools. The taxonomy is straight anyway — it has to be, because the wrong category purchase wastes a year.
Updated June 2026 · 8-minute read
Fleets save on fuel in two completely different ways: burning fewer gallons (less idling, smoother driving, better maintenance — the telematics bucket) and paying less per gallon (fueling at the right stops, on the right contracts, in the right tax jurisdictions — the purchasing bucket). The buckets stack, but they are not substitutes, and most buyer confusion comes from vendors blurring the line.
This guide is about the purchasing bucket — and within it, the five categories below, ordered roughly from most to least automated.
ValveRide Flow, Trimble Expert Fuel, Fuel Router
What it does: Take the route a truck is already running and decide where it should fuel, how many gallons to buy at each stop, and at what net price — factoring posted prices, the fleet's negotiated discounts, state fuel taxes, tank capacity, and hours of service. This is fuel purchasing optimization: same routes, same loads, cheaper gallons.
Best for: Fleets that dispatch trucks on customer-driven routes and buy meaningful volumes of diesel — from small fleets on up. The more trucks and the more states crossed, the more the math compounds.
The fine print: The category splits on one axis that matters: whether the plan is computed once at dispatch and locked, or re-optimized as the truck moves. Trimble Expert Fuel is the long-standing enterprise incumbent, built around dispatch-time fuel plans and sold to truckload carriers — its own materials describe it as designed for fleets of 50 or more trucks, typically as part of a Trimble TMS suite. Fuel Router positions itself as a lighter route-aware tool that recommends stops along existing routes without rerouting, with published pricing in the hundreds-to-thousands per month range depending on fleet size. ValveRide Flow re-optimizes continuously mid-route, enforces the fleet's own contracts, and reconciles every claimed dollar against the actual fuel card transaction.
Mudflap
What it does: A mobile app that gives drivers discounted prices at participating truck stops — typically independents and regional chains. The network negotiates volume pricing and passes part of it to the driver or fleet.
Best for: Owner-operators and small fleets that do not have negotiated fuel contracts of their own. If you have no discounts today, a network is the fastest way to get some.
The fine print: A discount network is a source of discounts, not an optimizer of them. It answers “where can I get a deal?”, not “given my route, my tank, my taxes, and all my contracts, where should this truck fuel and for how many gallons?” The two are complementary for some fleets — and a fleet that already holds strong Pilot, Love's, TA, or fuel-card contracts usually gets more from enforcing those than from adding another network.
AtoB, Coast, RTS, WEX, Comdata, EFS
What it does: Payment instruments with controls: per-driver limits, merchant restrictions, transaction reporting, fraud alerts, and network discounts at partner chains. Modern entrants like AtoB and Coast add software-first spend management on top.
Best for: Every fleet needs one — this is how trucking pays for fuel. The discounts attached to these cards are also the raw material a route-aware optimizer enforces.
The fine print: A fuel card tells you what was spent after the fact and gives you a discount schedule. It does not decide where the truck should have fueled, and the savings figures card vendors report are calculated by the vendor with no independent verification. That last point is exactly the gap per-transaction reconciliation exists to close.
Trucker Path, GasBuddy
What it does: Maps and apps showing posted fuel prices, amenities, parking, and reviews, powered by large driver communities. Drivers or dispatchers look at the map and make the call.
Best for: Owner-operators making their own fueling decisions, and any driver who wants amenity and parking intel alongside price.
The fine print: Visibility is not optimization. A price map shows the posted cash price — not your contract's net price at that stop, not the IFTA tax consequence of fueling in this state versus the next one, and not whether your tank and HOS clock make a cheaper stop 80 miles ahead actually reachable. For a fleet, leaving that math to each driver's judgment is exactly the leak optimization software exists to close.
Samsara, Geotab, Motive, Verizon Connect
What it does: GPS, ELD compliance, idle monitoring, driver behavior scoring, and maintenance — with fuel dashboards built on top. These reduce how much fuel the fleet burns: less idling, smoother driving, better-maintained trucks.
Best for: Most fleets above a handful of trucks already run one — and should. The consumption-side savings are real.
The fine print: Burning fewer gallons and paying less per gallon are different problems. Telematics attacks consumption; fuel optimization attacks purchasing. They stack — and several telematics ELDs (Samsara, Motive) are exactly how an optimizer like Flow delivers plans to the driver, so this is an integration relationship, not a substitution.
| Approach | Examples | How it saves | Decision-making | Savings verification |
|---|---|---|---|---|
| Continuous route-aware optimization | ValveRide Flow | Enforces the fleet's own contracts + IFTA tax math on every dispatch; re-optimizes mid-route | Automatic, per dispatch, updates as the truck moves | Per-transaction reconciliation; prediction accuracy published |
| Dispatch-time route-aware optimization | Trimble Expert Fuel, Fuel Router | Optimized fuel purchase plan computed when the load is dispatched | Automatic at dispatch; plan typically fixed once issued | Varies by vendor — ask |
| Discount network | Mudflap | Network-negotiated prices at participating stops | Driver picks from in-network deals | Vendor-reported |
| Fuel cards / spend management | AtoB, Coast, RTS, WEX, Comdata, EFS | Card-program discounts, spend controls, fraud screening | None — payment layer, not a planner | Vendor-reported |
| Price visibility | Trucker Path, GasBuddy | Shows posted prices; human decides | Manual, per driver | None |
| Telematics fuel features | Samsara, Geotab, Motive | Consumption reduction: idling, driver behavior, maintenance | Coaching and alerts | MPG trends (different bucket) |
Vendor characterizations reflect each company's own published positioning as of June 2026; pricing and features change — verify with the vendor. Yes, the highlighted row is ours; the four questions below are how to pressure-test that claim and everyone else's.
Flow is built for fleets that already hold negotiated fuel discounts — a fuel-card program, direct chain deals, or both — and want them enforced on every truck, every dispatch, without a dispatcher in the loop. Plans land in the driver's ELD next to the load, re-optimize as the truck moves, and every claimed dollar reconciles against an actual transaction. Growth runs $15 per truck per month, month-to-month; Enterprise adds managed integrations, automatic replanning, and SLAs.
And honestly, when it's not the buy: a single owner-operator with no contracts gets a faster first win from a discount network or a modern fuel card — come back when you hold discounts worth enforcing. And if your fuel problem is idling and driving behavior rather than purchase price, that is a telematics project, not a purchasing one.
Software that decides where each truck should fuel, how many gallons to buy at each stop, and at what net price — given the route it is already running, live station prices, the fleet's negotiated discounts, state fuel-tax differences, tank capacity, and hours of service. It does not change routes or delivery windows; it changes where along the route the gallons get bought. That distinguishes it from fuel cards (payment + discounts), discount networks (a source of deals), price apps (visibility only), and telematics (which reduces consumption rather than purchase price).
A fuel card is how the fleet pays for fuel and where its negotiated discounts live. Fuel optimization software is what makes sure those discounts actually get used: it routes each truck to the stop where the fleet's net price — posted price minus contract discount, adjusted for state tax — is best, within the route and the driver's hours. Most fleets need both; the card supplies the contracts, the optimizer enforces them on every dispatch.
Purchasing-side savings typically land in the $0.08 to $0.15+ per gallon range for fleets with negotiated contracts, depending on lanes, contract quality, and how badly discounts were leaking before. A truck running 100,000 miles a year at 6 MPG burns roughly 16,700 gallons, so each $0.10/gal recovered is about $1,670 per truck per year. The honest caveat: any vendor's savings number is only as good as its verification — ask whether claimed savings are reconciled against actual transactions or just modeled.
It depends on what discounts you hold. An owner-operator with no negotiated contracts usually gets the fastest win from a discount network or fuel-card program — you need discounts before enforcing them is worth anything. Once a fleet holds real contracts (a fuel card program with negotiated rates, or direct deals with Pilot, Love's, TA, or others), per-truck optimization pays for itself quickly even at small fleet sizes, which is why per-truck monthly pricing with no minimums matters.
Four questions separate the category: (1) Is the plan locked at dispatch, or re-optimized as the truck moves, prices change, and the HOS clock runs down? (2) Does it apply our existing contracts, or push us into the vendor's own fuel network? (3) Are claimed savings reconciled per-transaction against our fuel card data, or modeled? (4) Will the vendor publish its price-prediction accuracy — how close its predicted pump prices run to what drivers actually paid?
Researching the market? Our live US diesel price data is free to use and cite — the same feed our engine runs on.
Continuous re-optimization, your contracts, per-transaction reconciliation, published prediction accuracy. A 30-minute demo answers all four with your fleet's own numbers.