Performance cars
Gasoline pickups
+24%km per litre, Toyota Hilux on a G11: 8.97 → 11.14Belhasa Engineering & Contracting15 light and heavy vehicles tested for over three months; letter signed by the general manager.Signed letter (PDF) →
Products · Gasoline Series
Model G11
The complete gasoline optimization set for tanks up to 100 litres — Fuel Enhancer plus Air Refiner for the most complete combustion.
GasolineTank ≤ 100 LEnhancer + Air Refiner10-year service lifeMade in Taiwan
Not sure this is your model? Use the product selector →
Specifications
Model G11 at a glance
| Model | G11 |
| Fuel type | Gasoline |
| Tank capacity | Up to 100 litres |
| Package contents | Fuel Enhancer (100 L) × 1 · Air Refiner × 1 |
| Installation | Enhancer: fitted at a workshop (tank drained; placed through the fuel-pump opening or where the filler pipe joins the tank). Air Refiner: inside the air filter housing. |
| Activation | Starts working within about 30 minutes of installation |
| Service life | 10 years, no maintenance and no refills |
| Warranty | 12 months with serial-number registration at greentech.tw |
| Best for | Sedans, SUVs, sports cars and boats |
| Origin | Designed and manufactured in Taiwan · Taiwan and U.S. invention patents |
Where it fits
Sedans, SUVs, performance cars and gasoline pickups
For tanks up to 100 litres, with an Air Refiner on the intake side; the enhancer is fitted at a workshop.
What owners and testers found
1.6 sfaster per lap: best lap 1:15.8 → 1:14.2Subaru Impreza STI race car on a G11A 330 hp time-attack car run by the local distributor's team.Testimonial (PDF) →
Sharper throttlethe engine revs more freely and pulls harderOpel Corsa van on a G11A case recorded by the Hungarian distributor (in Hungarian).Testimonial (PDF) →
Results vary with vehicle condition, route and driving.
Fuel side and air side, in one visit
The workshop places the enhancer in the tank and the Air Refiner in the air box. Labour costs vary, so ask first.
Payback calculator
Run the payback on your own fuel bill
9.5%Your assumed saving rate
Grab Vietnam, 20 vehicles (2020)
Grab Vietnam, 20 vehicles (2020)
Saved per month —
Payback in about —
First-year net saving —
Most documented results: 5–25% less fuel. Each vehicle is measured against its own original fuel use — the more efficient the vehicle, the bigger the denominator and the smaller the % looks, but the litres still add up. Results vary with engine condition, load and route.
🌿 Fuel is only half the story — the emissions gains (idle CO down to zero in a government test) carry inspection and ESG value on top.
The evidence
All test results →Don’t take our word for it: see the documents
Government tests, fleet trials, lab reports and patents. Swipe, and open any card for the original document.
Government test · Ethiopia · G10A−17.95% fuel per kmECAE, Suzuki Dzire: 20.74 → 25.28 km/L; 2022Official report (PDF) →
Government test · Vietnam · 2025Idle CO down to zeroCần Thơ vehicle inspection centre, a car on a G10A; hydrocarbons −75%Case study (PDF) →
Standard procedure · USA · 2006+5.93% miles per gallonMGA Research, SAE J1321 on-road procedure, a 2005 Toyota Corolla (+2.4 MPG)Test report (PDF) →
Fleet trial · Vietnam9.5% average savingGrab riders, Ho Chi Minh City: 20 petrol motorbikes compared bike by bike; 2020Trial report (PDF) →
University lab · Hong Kong · 2008Chassis dynamometer testHong Kong Polytechnic University measured power and fuel consumption on the dynoTest report (PDF) →
PatentsPatented in many countriesUS 11,713,737 B1 and patents in other countriesSee the patents →Installation
Enhancer at a workshop, Air Refiner in the air box
How to install
It depends on the application
The enhancer must be in direct contact with the fuel, so it always goes inside the fuel tank.
Take the fuel cap off. Can you see the fuel?
✓Yes: drop it in
Motorcycles and scooters, generators and stationary machines, some boats and other machinery: the fuel is right there, so it is simple to drop the enhancer in.
!No: many cars
The filler often has an anti-siphon valve. The tank is reached through the fuel-pump or fuel-sender service opening instead: a job for a workshop, with the fuel drained first.
- 1Fuel-pump / fuel-sender service opening (usually under the rear seat)
- 2Where the filler pipe joins the tank, underneath
- ✕Filler neck and its anti-siphon valve
Never force it down a car's filler.It can jam in the filler pipe, and the pump nozzle will then keep cutting off every time you refuel.
Not sure? Have a qualified mechanic or an authorized Greentech installer do it. Labour costs vary, so ask for a price first.
Installation guide (PDF):English · 中文
⚠Fuel is hazardous and flammable. Do not smoke near the fuel tank.
G11 complete set: one more step for the Air Refiner
Any workshop can fit it.
Workshops and garages: become a distributor
Passenger cars are fitted in a workshop, so drivers come to you anyway.
Apply for the gasoline line →Partnership models →Measured results
What tests show for gasoline engines
+5.93% fuel economy
MGA Research, SAE J1321 on-road procedure on a 2005 Toyota Corolla (2006).
9.5% across 20 vehicles
Grab Vietnam ran a 20-vehicle field trial: 9.5% average savings, 21.2% best result.
CO cut to zero at idle
The Vehicle Technical Inspection Center in Can Tho, Vietnam measured idle CO reduced to zero on the test vehicle (2025).
Questions
Before you order
Can I use the G11 on a boat?
For boats we suggest the G10: the same enhancer, dropped in through the fuel fill of a built-in tank up to 100 litres. The Air Refiner in the G11 set is made for a car's air-filter housing. Boats save fuel too; more complete combustion raises engine speed and output, so ask the engine maker first whether the engine has room for it. All boat sizes →
Does it change anything on the engine?
No. The device is passive — no chemicals, no electronics and no engine modification. It sits in the fuel tank.
How soon will I see results?
The device activates within about 30 minutes. For a reliable before-and-after comparison, record fuel consumption over two to four weeks of normal use.
My tank is larger than 100 litres — which model do I need?
Gasoline models top out at 100 litres; for diesel tanks up to 200 or 500 litres see D21 and D51. Contact us for special gasoline applications.
How do I register the warranty?
Enter the serial number from the packaging at our product registration page. Warranty runs 12 months from registration.
Does it need maintenance or replacement?
No maintenance, no refills. The service life is 10 years; after that, simply replace the unit.
How do I know my unit is genuine?
Every genuine unit has a serial number you can verify on the registration page. Units bought outside authorized channels cannot be registered.
Ready for Model G11?
Order online, or request a quote and installation for your fleet.
Where to buy the G11
Authorised distributors with a page of their own — local pricing, installation and after-sales service in their market.