Fuel efficiency, measured properly.
The method we ask operators to use before drawing any efficiency conclusion — and the variables that invalidate a trial.
Asking whether a hydrogen fuel saver works, or looking for a hydrogen fuel saver for diesel? The PEM hydrogen fuel savings data we hold — first-party road logs, manufacturer trials and published dynamometer research — is published in field results, and you can model your own litre spend with the fuel savings calculator. For the mechanism behind oxyhydrogen fuel consumption reduction see hydrogen combustion enhancement, the in-cylinder side in engine performance and the exhaust side in emissions reduction.
How is fuel efficiency measured on a hydrogen-enhanced engine?
Compare litres per 100 km (road) or litres per engine hour (genset and marine) over a fixed baseline period before fitting against an equal period after commissioning, holding route, load, fuel supplier and operators constant. Fuel-card or flow-meter data only. We publish no blanket savings percentage — the measured figure on your own duty cycle is the figure that counts.
- Road metric: litres / 100 km from fuel-card or telematics data
- Stationary metric: litres / engine hour at a stated load factor
- Minimum trial: 2 weeks or 50 engine hours each side
- Control: route, payload, fuel supplier, drivers, season
- Include the unit's own 12 / 24 V DC alternator load in the comparison
- Discard periods with servicing, injector work or route changes
- Baseline
- ≥ 2 weeks / 50 h
- Post-install
- Equal period
- Data source
- Fuel card / flow meter
- Published claim
- None — measure it
What ruins a fuel trial.
Route or load change
A different corridor, gradient profile or generator load factor moves consumption more than most combustion changes.
Driver or operator change
Throttle habit and idle time dominate short-window comparisons.
Mechanical work mid-trial
Injector, turbo, air-filter or DPF service invalidates the comparison. Restart the baseline.
Tank-to-tank estimates
Fill-level variance is larger than the effect being measured. Use accumulated period data.
Run the numbers, then the trial.
- · Fuel savings calculator — model the effect of a given percentage on your own litre spend.
- · Fleet trials — structured multi-vehicle evaluation.
- · Field results — published operator data and methodology.
- · Compare systems — gas output and current draw per unit.
No projected, typical or expected fuel-saving figure is published. Actual results vary materially with engine condition, duty cycle, load profile, fuel quality, installation and operating conditions. A controlled field evaluation on your own equipment, with baseline data captured before installation, is required before any commercial projection.
Questions.
How much fuel will a unit save?
- We do not publish a fixed savings figure. Result spread depends on engine condition, duty cycle, load factor, fuel quality and driver behaviour, so the only number that matters is the one measured on your own equipment against a controlled baseline.
What metric should be used?
- Use litres per 100 km for road vehicles and litres per engine hour for generator sets and marine plant. Both should come from fuel-card or flow-meter data over a fixed period, not from single fills.
How long should a trial run?
- At least two weeks or 50 engine hours of baseline and the same again after commissioning, on the same routes or load profile. Longer is better where seasonal load varies.
Does the unit's own power draw count against savings?
- Yes, and it should be included. The unit draws 12 V or 24 V DC from the existing battery and alternator while the engine runs; that alternator load is part of the engine's work. Per-unit current draw is listed on each product page and on the comparison table.
Continue reading.
Hydrogen combustion enhancement
What it is, how PEM gas reaches the cylinder, and what it does not do.
Engine performance improvement
Flame speed, burn completeness and load response on diesel engines.
Emissions reduction
Soot, particulate and unburnt-fuel behaviour, and how to test it.
Visible smoke reduction
Smoke opacity findings per study, with the NOx trade-off disclosed.
Remote-site fuel logistics cost
Landed cost versus pump price, and why the same percentage moves more money.
Generator-set classes
Camp, prime, standby, rental, telecom, irrigation and ship's service sets compared.
Idle & part-load duty cycles
Reefers, camp gensets and high-idle plant — where the literature reports most room.
Hydrogen with biodiesel blends
Per-study findings for hydrogen enrichment on biodiesel, NOx disclosed.
Installation guide
Nine-step fitting sequence: mounting, wiring, gas line, commissioning.
Safety & compliance
On-demand gas, no storage, alarms, shutdowns and reversibility.
Troubleshooting
Alarms, low gas output, water quality and no-start diagnostics.
Case studies & field results
Published operator data and trial methodology.
Compare PEM systems
A-450 to DH-Power side by side: displacement, output, current draw.
Does it actually work? Evidence review
The published literature, the FTC/EPA history and the ACL context.
How it works
Gas path and established physics, explained with diagrams.
PEM vs alkaline
Membrane on water versus caustic KOH: servicing, purity, cost.
Sizing combined gas
Why PEM and alkaline gas-volume benchmarks are not interchangeable for ICE sizing.
Four hydrogen technologies
Enhancement vs H2ICE vs fuel cell vs chemical generation.
Compared with Hydrogen Fuel Systems
Honest comparison with the Perth-based Gen alkaline range.
Compared with H2i Technology
Hardware, pricing and evidence transparency versus the Victorian supplier.
Compared with dynaCERT HydraGEN
PEM versus alkaline, published price versus dealer quote, Verra versus ACCU.
Compared with HYDI
The South Australian manufacturer: UniSA testing, field history and quote path.
AU installation, warranty & safety
VSB 14 and VSB 6, ACL guarantees and documentation to keep.
Mining fleets
Haul trucks, dozers, drill rigs and site gensets: unit selection and dust.
Marine
Workboats, charter, fishing and ship's service gensets — no gas stored aboard.
Agriculture
Tractors, headers, pump sets and farm trucks across seasonal duty.
FAQ
Answers on fitment, water, warranty, freight and duty cycles.