Reduce Marine Fuel Costs by 5–15%
FuelMarble minerals install in your vessel's expansion tank — no engine modifications, no plumbing changes. Verified 7.33% year-on-year fuel reduction on a 55,810 DWT bulk carrier in active commercial service.
Marine EnquiryIndependently Trialled by Japanese Government Bodies
FuelMarble's underlying technology has been independently trialled by Japan's Ministry of Land, Infrastructure, Transport and Tourism (MLIT) and the Japan New Fishing Vessel & Fishery Technology Research Association. The MLIT trial on a 12,000-tonne ferry recorded a 5.9% fuel reduction and ¥52.8 million (~$352,000 / ~£278,000) in annual savings. The fishing association's 2-year trial recorded an average 5.1% reduction, rising to 11% at optimal engine RPM.
Sources: Japan MLIT Maritime Bureau, Coastal Shipping Rationalisation Report, Heisei 22 (2010); Suisan Shuho No.1826 (2011)
Fewer Fuel Stops. Lower Voyage Costs.
In marine operations, fuel efficiency directly determines profitability and range. FuelMarble delivers measurable improvements on every engine hour.
Verified Voyage Fuel Savings
Fuel is the largest operating cost on any vessel. FuelMarble's 5–15% consumption reduction translates directly to measurable savings per voyage — verified on commercial bulk carriers in active service.
Compatible with Heavy Fuel Oil (HFO)
FuelMarble works with both marine diesel and heavy fuel oil engines — making it suitable for commercial bulk carriers, offshore vessels, and large leisure craft running on C Heavy Oil.
Reduced Exhaust Emissions
Improved combustion efficiency results in cleaner exhaust profiles. As international maritime emissions regulations tighten under IMO 2030 and beyond, FuelMarble helps vessels move towards compliance.
No Engine Modifications Required
FuelMarble installs into the engine's freshwater expansion tank — no modifications to the engine, fuel system, or exhaust. No impact on classification society requirements. Fully reversible.
Extended Engine Service Intervals
Cleaner, more stable combustion reduces internal engine wear and deposit buildup. This translates to longer intervals between scheduled maintenance — reducing haul-out frequency and servicing costs.
Passive — No Ongoing Action
Once installed, FuelMarble requires no maintenance, no servicing, and no consumables. The FuelMarble mineral pack works continuously as coolant circulates — every engine hour delivers results.
Measured Fuel Reduction Across Vessel Types
Fuel consumption data drawn from monitored commercial marine operations — offshore fishing vessels and express passenger ships.
Active commercial fishing vessel · Monitored over full fishing season
Express passenger ferry · Measured across regular scheduled route
Fuel reduction figures are drawn from monitored commercial marine operations. Results vary by vessel type, engine displacement, route profile, and operating load. Contact our team for a vessel-specific assessment.
How FuelMarble Works Onboard
A passive, three-step process — from installation to verified fuel savings.
Install in Expansion Tank
Coolant Circulates Through Minerals
Engine Runs Cooler, Burns Less Fuel
Compatible With Any Freshwater-Cooled Vessel
FuelMarble works on any marine engine with a freshwater cooling circuit — from offshore fishing vessels to large bulk carriers running on heavy fuel oil.
Bulk Carriers & Cargo Ships
Commercial vessels on long international routes carry the highest fuel burden. A 5–15% consumption reduction on voyages between North America, Asia, and Europe delivers substantial annual savings — verified by the TRES FELICES case study.
Fishing Vessels & Trawlers
Fishing fleets operating hundreds of engine hours per season benefit significantly from 5–10% diesel reduction. Lower fuel costs per trip improve margins for independent operators and commercial fleets alike.
Passenger Ferries
Express passenger ships and roll-on/roll-off ferries running scheduled routes achieve consistent fuel savings across every sailing. Trial data shows approximately 5.9% fuel reduction on express passenger vessels.
Offshore & Support Vessels
Offshore support vessels, anchor-handling tugs, and platform supply vessels operating extended offshore schedules benefit from lower per-hour fuel consumption — reducing operational costs over long deployments.
Verified on a 55,810-Tonne Bulk Carrier
TRES FELICES — Tamai Steamship
IMO CII Compliance Context
Commercial vessel operators under CII pressure can document a measurable fuel consumption reduction. FuelMarble's independently verified 7–8.31% fuel efficiency improvement reduces your vessel's Carbon Intensity Indicator score — with a published test methodology that qualifies as evidence for CII improvement reporting.
Commercial Vessel Applications
Reduces diesel consumption on extended voyages
Applicable for inland waterway diesel engines
Works with heavy fuel oil and marine diesel
TRES FELICES — 7.33% Year-on-Year Fuel Reduction
A documented case study from Tamai Steamship Co., Ltd. monitoring fuel consumption before and after FuelMarble installation on a 55,810 DWT bulk carrier.
TRES FELICES — Bulk Carrier
Tamai Steamship Co., Ltd. · Japan
FuelMarble mineral pack (20 kg) installed across 2 freshwater expansion tanks. No engine modifications. No system downtime.
Data sourced from Tamai Steamship Co., Ltd. operational logs comparing same-month year-on-year consumption. CO₂ credit value calculated at prevailing carbon market rates. Annual saving figures based on full-year projection from monitored periods.
USD and GBP equivalents are approximate — based on Q1 2026 exchange rates (1 USD ≈ ¥149, 1 GBP ≈ ¥189). Actual value varies with currency movements.
Prepare for Tightening Maritime Emissions Rules
The International Maritime Organisation (IMO) continues to tighten emissions standards for commercial shipping. NOx and SOx reduction targets are becoming mandatory across more vessel categories and operating areas.
FuelMarble's improved combustion efficiency produces cleaner exhaust profiles, helping vessel operators move towards compliance — without engine replacement or costly exhaust treatment systems.
NOx Emission Reduction
FuelMarble's improved combustion process produces lower NOx output — relevant in the context of IMO Tier III NOx requirements for vessels operating in NOx Emission Control Areas (NECAs).
Port State Control
Vessel inspections under Port State Control increasingly scrutinise emission performance. FuelMarble improves the combustion profile of your engines without altering their fundamental operation.
No Classification Society Impact
As a passive coolant-circuit device, FuelMarble does not modify engine hardware or systems. It does not require approval from classification societies such as Lloyd's Register or DNV.
Reduce Your Vessel's Fuel Costs
Speak to our marine team for a vessel-specific assessment. We will advise on the right configuration for your engine type, coolant system, and operational profile.
Marine EnquiryMore FuelMarble Applications
Save up to 20% on fuel in personal cars, vans, and SUVs. Drop-in coolant installation.
22.14% fuel efficiency gain on city route buses. Verified by Yamanashi Kotsu, Japan 2024.
Save ~£8,000 per year on a 10-vehicle delivery fleet. DPF protection and zero downtime.