Two Small Fleets Show How Natural Gas Cuts Fuel Costs Without Scale

How do small fleets make natural gas work without buying 500 trucks?

Detmar Logistics operates 180 heavy-duty trucks and is expanding its compressed natural gas fleet from 60 to 80 units, including new tractors powered by Cummins' 15-liter natural gas engine. The regional carrier built its own CNG fueling infrastructure and is working on a second station, a vertical integration play that stabilizes fuel costs while pairing with renewable natural gas to lower emissions.

FTC Transportation runs 25 long-haul trucks and takes the opposite approach: newer equipment to meet current emissions standards, aerodynamic upgrades, low-rolling-resistance tires, and tire-inflation systems to improve performance without building fueling infrastructure.

Both fleets are reducing fuel burn and emissions, but the paths diverge at the fueling question. Detmar owns the pump. FTC buys efficiency and relies on public or partner stations when natural gas makes sense for a route.

Why owning the fueling station matters for a 180-truck fleet

Detmar's CNG infrastructure investment removes the biggest barrier for small and mid-size fleets considering natural gas: fuel availability. A carrier running dedicated regional routes can justify building a station when the fleet size supports the capital outlay and the routes return to the same yard daily.

The second station under development suggests Detmar is expanding its natural gas footprint beyond a single terminal. For fleets operating multiple terminals or running lanes that connect two owned facilities, a second station turns natural gas from a single-terminal experiment into a scalable fuel strategy.

Renewable natural gas, biomethane captured from landfills, wastewater treatment plants, or agricultural waste, delivers the same BTU content as fossil CNG but qualifies for federal and state low-carbon fuel credits. Detmar's pairing of owned infrastructure with RNG procurement locks in both fuel-cost stability and emissions reductions without waiting for public RNG station buildout.

The efficiency stack for fleets that can't build a station

FTC Transportation's 25-truck fleet uses newer equipment as the baseline: trucks that already meet EPA emissions standards without retrofits. The fleet then layers on aerodynamic upgrades, low-rolling-resistance tires, and tire-inflation systems to reduce fuel burn across operations.

This approach works for fleets running long-haul or irregular routes where natural gas fueling infrastructure is sparse. The efficiency stack, aero, tires, inflation monitoring, delivers 5% to 10% fuel savings without requiring a carrier to own a pump or commit to a single fuel type.

For a 25-truck fleet running 100,000 miles per year per truck at 6.5 mpg, a 7% efficiency gain saves roughly 1,077 gallons per truck annually. At $3.50 per gallon diesel, that's $3,770 per truck, or $94,250 fleet-wide. The payback on aero kits and tire upgrades typically runs 18 to 24 months.

Where natural gas pencils out for fleets under 200 trucks

Detmar's model works when three conditions align: dedicated regional routes, a yard the fleet owns or controls, and enough trucks to justify the station capital cost. A CNG fast-fill station capable of fueling 50 to 80 trucks runs $1 million to $2 million installed, depending on compressor capacity and site prep. Fleets running 60-plus natural gas trucks can amortize that cost over three to five years when diesel-to-CNG savings run $1.00 to $1.50 per diesel-gallon-equivalent.

FTC's model works when routes are variable, the fleet is too small to own infrastructure, or the carrier wants fuel flexibility. Which routes make natural gas trucks pencil out depends on fueling access, drayage, intermodal, and dedicated lanes with known station locations are where natural gas works without owned infrastructure.

For fleets in between, 50 to 150 trucks running a mix of dedicated and spot freight, the decision hinges on route density. A carrier running 80% of its miles within a 200-mile radius of a single terminal can justify a station. A carrier running 50% spot freight across ten states cannot.

The idle-time and speed-limiter savings Detmar stacks on top

Detmar uses auxiliary power units to cut idle time and speed limiters set at 67 mph to reduce fuel burn. APUs eliminate the need to idle the main engine for cab climate control: a practice that burns roughly 0.8 gallons per hour and adds wear to emissions systems.

For a regional fleet running shorter lengths of haul, the APU payback is faster than for long-haul carriers. A truck idling 1,200 hours per year burns 960 gallons at idle. An APU running on diesel or battery cuts that to near zero, saving $3,360 per truck annually at $3.50 per gallon.

Speed limiters set at 67 mph reduce fuel consumption by 5% to 8% compared to trucks running 70 to 75 mph, depending on terrain and load. The trade-off is trip time: a 500-mile run at 67 mph takes 7.5 hours versus 7.1 hours at 70 mph. For regional carriers running multiple short runs per day rather than single long hauls, the time penalty is negligible and the fuel savings compound.

What changes for a 10-truck fleet looking at natural gas in 2026

A 10-truck fleet cannot justify building a CNG station. The capital cost per truck is prohibitive and the utilization rate too low. But a 10-truck fleet running dedicated lanes, drayage from a port, intermodal shuttles between a rail ramp and distribution centers, or regional delivery routes that start and end at the same yard: can lease natural gas trucks and fuel at public or partner stations.

Cummins' 15-liter natural gas engine, the same unit Detmar is spec'ing, is available in Class 8 tractors from multiple OEMs. The engine delivers 500 horsepower and 1,850 lb-ft of torque: comparable to a diesel in the same weight class. Lease rates for natural gas trucks run $200 to $400 per month higher than diesel equivalents, but fuel savings of $1.00 to $1.50 per DGE can offset the lease premium when a truck runs 100,000-plus miles per year.

The fueling question remains the gate. A 10-truck fleet needs access to CNG within 50 miles of its yard or along its primary lanes. Public CNG stations are concentrated in California, Texas, and the Northeast corridor. Fleets operating outside those regions face longer fueling detours that erase the per-gallon savings.

For fleets that cannot access natural gas infrastructure, FTC's efficiency stack, newer trucks, aero, tires, inflation monitoring, delivers measurable fuel savings without fuel-type risk. The ROI is slower but the operational flexibility is higher.