Solutions · Cars, taxis & motorcycles

Lower your monthly fuel bill

Over a year the savings add up to a real sum — and rising fuel prices hurt less. One enhancer in the fuel tank: motorcycles drop it in, cars have it fitted at a workshop; about ten years in service, nothing to maintain. More than 58,000 serialised units already run in cars, taxis and motorcycles.

Buy online Find your vehicle

9.5%average saving, 20 Grab motorcycles, Ho Chi Minh City

+21%fuel economy, gasoline car, official test

−93.6–100%carbon monoxide, official emission test, Vietnam 2025

58,000+serialised units in the field

Each figure comes from the fleet or test named on this page. Results vary with vehicle condition, route and driving.

Why your car burns more than it should

Where your fuel money goes

Nobody controls the price at the pump. What you can control is how much of every litre turns into distance.

Stop-start traffic

City driving, idling and short trips are where engines burn fuel least completely.

Carbon build-up

Deposits build up over the years and combustion gets worse: more fuel, more smoke.

Every month, for years

A few percent more distance from every tank, month after month, adds up to real money over the life of the car.

01 · The products

Pick by fuel and tank size

Gasoline or diesel, scooter or SUV: the enhancer is chosen by tank capacity. Motorcycles take it through the filler; cars have it fitted at a workshop.

For gasoline engines

Gasoline Fuel Enhancer

Where it goes: into the fuel tank. Motorcycles: through the filler. Cars: at a workshop, which drains the tank and places it through the fuel-pump opening or where the filler pipe joins the tank.
Sizing: G-Ball for motorcycles and scooters, G10A for small cars, G10 or G11 for cars, SUVs and taxis.
Air Refiner: the G11 adds an Air Refiner at the air intake.
After fitting: nothing to maintain; the car stays exactly as its maker built it.

G-Ballup to 20 L G10Aup to 60 L G10up to 100 L G11up to 100 L + Air Refiner

For diesel engines

Diesel Fuel Enhancer

Where it goes: into the fuel tank. Diesel cars and pickups: at a workshop, which drains the tank and places it through the fuel-pump opening or where the filler pipe joins the tank.
Sizing: D-Ball for small diesel engines up to 20 L, D10 or D11 for diesel cars, pickups and SUVs up to 100 L.
Air Refiner: the D11 adds an Air Refiner at the air intake.
After fitting: no engine, fuel-line or electronics modification, and nothing to service.

D-Ballup to 20 L D10up to 100 L D11up to 100 L + Air Refiner

02 · Applications

Pick your vehicle

Four kinds of vehicle: motorcycles drop it in, cars are fitted at a workshop. Pick yours to see which model it takes and what has been measured.

1Private cars & SUVsG10A · G10 / G11

2Taxis & ride-hailing carsG10 / G11 · D10 / D11

Grab ride-hailing riders in Ho Chi Minh City holding Greentech units

3Motorcycles & scootersG-Ball

4Diesel pickups & SUVsD-Ball · D10 / D11

Vehicle by vehicle

How it is fitted, and what has been measured

1 · Private cars & SUVs

Private cars: the same roads, fewer fill-ups

For a gasoline or diesel car the change is invisible and the effect is not: the same routes, the same driving, fewer litres. On a passenger car it is fitted at a workshop: the tank is drained, then the enhancer goes in through the fuel-pump opening or where the filler pipe joins the tank. Labour costs vary by area, so ask your workshop first. After that, nothing to maintain.

Engines with carbon build-up benefit twice: combustion improves from the first tank, and engine carbon deposits reduce over the following weeks.

ModelsG10A · up to 60 L G10 / G11 · up to 100 L

Measured in official tests

+21%fuel economy (km per litre) on a gasoline Suzuki Dzire: Ethiopian Conformity Assessment Enterprise, official test, 2022 · report
−100%carbon monoxide, and −75% hydrocarbons, on a gasoline car with a G10A: official emission test, Can Tho Centre for Technical Inspection of Road and Waterway Vehicles, Vietnam, June 2025 · report · case study
+24%km per litre on a gasoline Toyota Hilux with a G11 in city driving, 8.97 → 11.14 km/L: Belhasa Engineering & Contracting, Dubai · letter, 2020

Where it started: the technology’s first lab tests, 2006–2008, are listed car by car in the test reports below and published in full on Official Reports.

2 · Taxis & ride-hailing cars

Taxis and ride-hailing cars: margin on every shift

A taxi on two shifts burns several times what a private car burns, so the same percentage saving is worth several times more a year — straight off the operating cost.

Have it fitted at the next service; afterwards there is nothing to service and nothing for the driver to remember. In Dubai, Belhasa Engineering & Contracting tested 15 light and heavy vehicles for more than three months before listing its whole fleet for purchase.

ModelsG10 / G11 · gasoline D10 / D11 · diesel

Measured on working vehicles

15–25%average fuel saving across 15 light and heavy vehicles after more than three months: Belhasa Engineering & Contracting, Dubai · letter, 2020

Early test: a dynamometer and emissions test on an LPG taxi — report.

Taxi, bus and truck fleets →

3 · Motorcycles & scooters

Motorcycles and scooters: our largest installed base

Most of the 58,000+ serialised units in the field ride on two wheels — delivery riders, ride-hailing drivers and commuters across Asia. The G-Ball is sized for tanks up to 20 litres and drops straight in.

For a rider, fuel is paid out of every day’s earnings. A smoother engine and fewer litres show up the same week.

ModelG-Ball · up to 20 L

Measured on a ride-hailing fleet

9.5%average fuel saving on 20 Grab drivers’ motorcycles in Ho Chi Minh City; best result 21.2% · report, 2020
75%of the drivers reported a smoother-running engine after fitting
−93.6%carbon monoxide, and −74% hydrocarbons, on a motorcycle fitted with Greentech: official emission test, Can Tho Centre for Technical Inspection of Road and Waterway Vehicles, Vietnam, June 2025 · report · case study

4 · Diesel pickups & SUVs

Diesel pickups and SUVs: more kilometres from the same tank

Diesel pickups and SUVs take a D10 or D11 in tanks up to 100 litres; small diesel engines up to 20 litres take a D-Ball. Diesel cars and pickups are fitted at a workshop too: the tank is drained and the enhancer placed through the fuel-pump opening or where the filler pipe joins the tank.

ModelsD-Ball · up to 20 L D10 / D11 · up to 100 L

Measured

−33.6%fuel used on a diesel Toyota Hilux with a D10, 14.44 → 21.75 km per litre: Ethiopian Conformity Assessment Enterprise, official test, 2022 · report
+16%km per litre on a diesel JMC pickup with a D11 in city driving, 8.68 → 10.05 km/L: Belhasa Engineering & Contracting, Dubai · letter, 2020

Early lab work, 2008: an FTP-75 test on a 2003 Dodge RAM diesel at California Environmental Engineering — report.

Running a fleet? Taxis, delivery vans and rider fleets are quoted per vehicle and fitted at the depot. Commercial fleets →

Real-world use

Same road every day? Count your fill-ups

Drive the same route to work every day, the same way, and the only thing that changes is the Greentech in the tank — so when you fill up less often, that is fuel you did not have to buy. Gasoline or diesel, it works the same way.

Our own car · gasoline

Toyota Yaris

3 → 2fill-ups a month

The Yaris is already known as a frugal little car. After fitting Greentech it went from three fill-ups a month to two — it really does save fuel.

Our team’s own car · everyday fill-ups

Our own car · diesel · D11

Hyundai Santa Fe

2.5 → 2fill-ups per round trip

A long north–south round trip used to take two and a half tanks. With a D11 in the tank it takes one fill-up on the way out and one on the way home — and the SUV pulls harder too.

Our team’s own car · fitted with a D11 →

Minh Phu Seafood’s fuel-quota request, signed and stamped

Company car · Ho Chi Minh City · 2022

Minh Phu Seafood’s Subaru

18 → 16fuel quota, litres per 100 km

A month after fitting, the driver felt the car was using about 15% less fuel and asked the company to lower his own fuel quota. His team leader and management signed it off, with the company seal.

Signed request (PDF, Vietnamese) · Case study (PDF)

The Toyota Yaris and the Hyundai Santa Fe are our own team’s cars, and the figures are their everyday fill-ups; the Minh Phu Subaru is a document signed by the customer. How much each car saves depends on its original fuel consumption, its condition and its route.

Same road every day? Pick your model by fuel and tank size, and have your workshop fit it at the next service. Pick your model →

Test reports, vehicle by vehicle

Every passenger vehicle with a test report

Cars, pickups, taxis and motorcycles measured by government test centres, universities, laboratories and fleet operators. Each card names the vehicle, the method and who ran the test, and links to the full report.

Green: fuelBlue: exhaust

Official tests and working fleets, 2019–2025

Government and industry test centres, and fleets measuring their own vehicles on their own routes.

17.95%less fuel

Suzuki Dzire

Gasoline · G10A · Ethiopia · 2022

Official test by the Ethiopian Conformity Assessment Enterprise to CES 6655:2021: 20.74 → 25.28 km per litre.

Report (PDF)

33.6%less fuel

Toyota Hilux

Diesel · D10 · Ethiopia · 2022

Same official test: 14.44 → 21.75 km per litre.

Report (PDF)

+24%km per litre

Toyota Hilux

Gasoline · G11 · Dubai · 2020

City driving in Belhasa Engineering & Contracting’s own fleet: 8.97 → 11.14 km per litre.

Letter (PDF)

+16%km per litre

JMC pickup

Diesel · D11 · Dubai · 2020

Same fleet, city driving: 8.68 → 10.05 km per litre.

Letter (PDF)

6.8%less fuel at 90 km/h

Buick

Chassis dyno · Guangzhou · 2019

Automobile Parts Test Center, Guangzhou, with the intake unit (Air Refiner) fitted at the air filter: 6.8% less fuel at a steady 90 km/h, 9.0% less at 120 km/h.

Report, page 4 of 8 (PDF)

9.5%average saving

20 Grab motorcycles

Ride-hailing fleet · Ho Chi Minh City · 2020

Drivers’ own motorcycles, measured before and after: 9.5% less fuel on average, 21.2% on the best one; 75% of the drivers said the engine ran smoother.

Report (PDF)

100%less CO

Gasoline car

G10A · Can Tho, Vietnam · 2025

Official exhaust test to TCVN 6438:2018 at the Can Tho Centre for Technical Inspection of Road and Waterway Vehicles: the carbon monoxide reading fell to 0, hydrocarbons from 12 to 3 ppm (−75%).

Report (PDF) · Case study (PDF)

93.6%less CO

Motorcycle

G10A-20L · Can Tho, Vietnam · 2025

Same official test session: carbon monoxide −93.6%, hydrocarbons from 97 to 25 ppm (−74%).

Report (PDF) · Case study (PDF)

Where it started: the first lab tests, 2006–2008

The technology’s first independent measurements, made when it was sold as the Moletech / Mtech Fuel Saver. They are listed to show where it comes from.

10.9%less fuel

2003 Lexus 3.0

Chassis dyno · Hong Kong · 2008

Hong Kong Polytechnic University, Department of Mechanical Engineering: the same computer-controlled 106 km cycle on a chassis dynamometer, 4.51 → 4.02 litres.

Report (PDF)

+6%fuel economy

2005 Toyota Camry

FTP + highway cycles · USA · 2008

At Lotus Engineering’s laboratory in Ann Arbor, monitored by California Environmental Engineering: federal city (FTP) and highway test cycles on a chassis dynamometer, with and without the device, on a low-emission PZEV car.

Report (PDF)

+5.93%miles per gallon

2005 Toyota Corolla

SAE J1321 · USA · 2006

MGA Research, on the oval track of its Wisconsin proving ground, following SAE J1321: 40.15 → 42.53 miles per gallon.

Report (PDF)

+4.28%miles per gallon

2000 GMC Sierra

SAE J1321 road test · USA · 2007

A pickup with 107,000 miles on a fixed highway route, using J1321 forms under the guidance of California Environmental Engineering technicians: 20.30 → 21.17 mpg, average of three runs.

Report (PDF)

96.85%less HC at idle

2003 Toyota 1.6

Idle emissions · Taiwan · 2006

Chun Yuan Vehicle Technology, an independent vehicle test laboratory: hydrocarbons at idle fell from 127 to 4 ppm.

Report (PDF)

90%less CO and HC

1996 Toyota

Idle emissions · Taipei · 2006

Taipei City Environmental Protection Bureau inspection station, re-tested a week after fitting: carbon monoxide 0.20% → 0.02%, hydrocarbons 101 → 10 ppm.

Report (PDF)

86.48%less HC at idle

2004 Honda CR-V

Idle emissions · Taipei · 2006

Same inspection station: hydrocarbons at idle 37 → 5 ppm.

Report (PDF)

96%less HC

Ford Falcon LPG taxi

Dynamometer · Australia · 2007

Autotech Engineering, on a Dyno Dynamics dynamometer: a week after fitting, peak power was about 11% higher; at a steady 87 km/h, hydrocarbons fell from 25 to 1 ppm and NOx by 29% or more.

Report (PDF)

Hungary: 18 owners’ own fuel records, 2010–2012

Owners sent their before-and-after averages to the Greentech Hungary website, which published them. Figures are litres per 100 km, before → after fitting, listed as submitted with the largest saving first; the notes are the owners’ own.

Gasoline · 10 vehicles
Vehicle	L/100 km	Saving
Mitsubishi Carisma 1.6 GLX JubileeG11 · 60% city, 40% highway	8.20 → 6.03	26.46%
Mazda 323 1.5G11	8.30 → 6.20	25.30%
Mitsubishi Carisma 1.6 GLXG11 · 90% city	8.20 → 6.21	24.27%
Gilera Runner 50G10 · 50 cc scooter; cold-start trouble gone, better pick-up to 35 km/h	5.25 → 4.12	21.52%
Opel Corsa C Van 1.2G11 · livelier acceleration	7.05 → 5.59	20.71%
Suzuki Swift 1.3G11	6.90 → 5.50	20.29%
VW Golf III 1.4G11	7.10 → 5.75	19.01%
Suzuki Ignis 1.3G11 · city driving	8.30 → 6.82	17.83%
Toyota Corolla 1.6G11 · used together with another product	7.80 → 6.50	16.67%
Opel Zafira 1.8G11	9.00 → 7.70	14.44%

Diesel · 8 vehicles
Vehicle	L/100 km	Saving
Citroën Berlingo 2.0 HDiD11 · city only	6.30 → 5.35	15.08%
Fiat Ducato 2.3 JTDD11 · mail-delivery operator	9.80 → 8.40	14.29%
Fiat Ducato 2.8 TDID11 · firmer acceleration, quieter engine	8.60 → 7.38	14.19%
Renault Master 2.8 DTID11	8.70 → 7.52	13.56%
VW Caddy 1.9 TDID11	7.00 → 6.09	13.00%
BMW X5 3.0dD11	13.50 → 11.78	12.74%
Opel Astra G 1.7 CDTiD11 · 30% city, 70% highway, air-con on	6.80 → 5.95	12.50%
SEAT Alhambra 2.0 TDID11 · chip-tuned engine	9.00 → 7.91	12.11%

All 18 records, original screenshots (PDF) →

A dynamometer cycle, a road test and an owner’s fill-up log measure different things and are not directly comparable, so we never average them. Results vary with vehicle condition, route and driving. Every report in full: Official Reports →

What you notice after fitting

What your car gets from the first tank

More kilometres from every tank

The same routes and the same driving, so you fill up less often.

Cleaner exhaust

An official emission test in Vietnam measured carbon monoxide and hydrocarbons falling sharply on a car and a motorcycle.

Fit once, about ten years

Motorcycles: drop it in yourself. Cars: fitted at a workshop. Nothing to maintain afterwards.

Nothing modified

Engine, fuel lines and electronics stay exactly as the maker built them.

Nothing to maintain

No consumables, no refills and no cleaning.

About ten years in the tank

One unit keeps working for about ten years.

Do the maths

What 9.5% looks like on a taxi

An example at the 9.5% the Grab fleet averaged, for a taxi using 12 litres of fuel a day, 300 days a year.

1.1 Lless fuel every working day

≈ 340 Lless fuel every year

≈ 3,400 Lover about ten years in the tank

Your own number comes from your own fill-ups: note litres and kilometres, or log them in the free Fleet Fuel Log. Results vary with vehicle, route and driving. Open the Fleet Fuel Log →

Questions drivers ask

Before you buy

How do I fit it?

Motorcycles: open the fuel cap and drop it in. Passenger cars: a workshop drains the tank, then places the enhancer through the fuel-pump opening or where the filler pipe joins the tank; labour costs vary by area, so ask your workshop first. On the G11 and D11 the Air Refiner is also fitted at the air intake.

Will it work with my car or motorcycle?

It works with gasoline and diesel engines; the model is chosen by tank capacity. Not sure which one? Use the product selector.

Does it change the engine or the fuel?

No. Nothing in the engine, fuel lines or electronics is modified, and nothing is added to the fuel.

How long does it last?

About ten years, with nothing to maintain or refill.

How will I see the difference?

If you drive the same route every day, simply count your fill-ups. For an exact figure, note the litres and kilometres at each fill-up, before and after — or log them in the free Fleet Fuel Log, which does the maths for you.

Where can I buy it?

Online in our shop, from the Greentech distributor in your country, or ask for a fleet quote for taxi and rider fleets.

03 · Buy or get a quote

Three steps

1 · Pick your model

By fuel and tank size: G-Ball, G10A, G10 / G11, D-Ball or D10 / D11.

2 · Buy online or get a fleet quote

Single units in the shop; taxi and rider fleets quoted per vehicle.

3 · Fit it, drive, compare

Watch how far each tank takes you and how often you fill up — or log it in the Fleet Fuel Log.

Every tank, a little further

Buy a unit for your car or motorcycle online, or send us your taxi or rider fleet for a quote.

Buy online Get a fleet quote