Renault is reintroducing a lower-cost ownership option to its Symbioz lineup with the new Eco-G 120 model, which runs on both gasoline and liquefied petroleum gas (LPG). The move comes as automakers continue to explore diverse powertrain solutions amid a shift towards hybrid and electric vehicles.
The Renault Symbioz Eco-G 120 aims to appeal to budget-conscious drivers, offering potential fuel savings of around €3 per 100 km and a combined range of up to 1,400 kilometers thanks to its dual fuel tanks. This strategy positions the Symbioz as an alternative to models like the Dacia Duster ECO-G, which already features LPG technology, and gasoline-powered compact SUVs such as the Renault Captur and Peugeot 2008.
Understanding Bi-Fuel Technology
The Renault Symbioz Eco-G 120 utilizes a gasoline engine capable of running on LPG as well. The system incorporates two separate fuel systems and tanks: a 48-liter gasoline tank and a 50-liter LPG tank. This dual-tank setup contributes to the vehicle’s extended overall range.
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Inside the vehicle, a fuel selector button and a dedicated LPG level display indicate the system’s status. Many systems automatically start on gasoline when cold, switching to LPG once the engine reaches operating temperature. The transition between fuels is generally seamless, though a slight change in engine sound or responsiveness may be noticeable.
Externally, the LPG filler port is a key identifier, typically located behind the fuel door with an adapter or nearby. On used vehicles, labels in the engine compartment, a vaporiser/regulator, and specific hoses can also indicate an LPG conversion.
The vehicle’s registration card will also reflect the type of fuel system. Modern LPG vehicles typically receive a Crit’Air 1 emissions sticker, which is relevant for access to low-emission zones, although local regulations may vary.
Maintenance Considerations
A modern LPG vehicle doesn’t require extensive mechanical expertise, but it does necessitate specific maintenance. The ignition system is central, as LPG demands a strong spark. Workshops typically recommend replacing spark plugs between 30,000 km and 60,000 km, depending on the engine and plug type. Neglecting this can lead to misfires, increased fuel consumption, and rough running.
Another key consumable is the LPG filter (liquid and/or gas phase, depending on the system), with replacement intervals typically between 20,000 km and 40,000 km. The cost is relatively low, but a clogged filter can cause starting problems and reduced performance.
A well-maintained LPG engine can easily exceed 200,000 km, particularly with regular highway driving. However, intensive urban use, with frequent fuel switching and short trips, puts more stress on certain components. It’s also worth noting that LPG burns cleanly, and on some engines, valve seat wear can be a concern, although factory-installed systems are designed to mitigate this.
The LPG tank itself doesn’t require annual replacement, but It’s subject to inspection and compliance regulations. For original factory installations, routine checks during maintenance and monitoring for aging pipes are typically sufficient. If a gas odor is detected, immediate action is required: stop, ventilate, and take the vehicle to a workshop.
Finally, it’s significant to remember that the primary benefit of the Renault Symbioz Eco-G 120 is reduced running costs. If your priority is silent city driving and short trips, a full hybrid like the Renault Symbioz E-Tech 160, with its 1.2 kWh battery and 3 to 4 km of electric range, might be a better fit, even if the fuel savings are realized in a different way.
Cost of LPG Driving
Renault is positioning the Renault Symbioz Eco-G 120 as an accessible entry point into the Symbioz range, with a starting price of €33,800 in 2026. The goal for buyers is to recoup the investment not through technical specifications, but through fuel cost savings, particularly with high annual mileage.
The calculation depends on fuel prices, but Renault estimates fuel savings of around €3 per 100 km when primarily running on LPG, despite generally higher consumption compared to gasoline. In practice, LPG consumption is often 10% to 20% higher, offset by the lower cost per liter. The savings become significant on highway journeys.
To visualize expenses, here’s a realistic breakdown:
| Poste | Ce que vous observez | Action recommandée | Coût estimé |
|---|---|---|---|
| Filtres GPL | À-coups au gaz, perte de souplesse | Remplacement périodique | 60 € à 150 € |
| Bougies | Ratés, démarrages difficiles, conso en hausse | Remplacement plus fréquent qu’en essence | 80 € à 250 € |
| Bobines | Ratés d’allumage, voyant moteur | Diagnostic puis remplacement si nécessaire | 150 € à 600 € |
| Contrôle étanchéité GPL | Odeur de gaz, doute après choc | Contrôle immédiat en atelier | 50 € à 120 € |
| Surcoût carburant essence | Vous roulez souvent en essence par habitude | Changer de réflexe, rouler au gaz dès que possible | 3 € environ par 100 km “perdus” |
The extended range is another benefit. With 48 liters of gasoline and 50 liters of LPG, Renault advertises a total range of up to 1,400 km without refueling. This is particularly appealing to frequent travelers, commercial drivers, families, and those who prefer not to plan their journeys around charging stops.
However, it’s important to note that the maximum range assumes the use of both fuels. In practice, drivers will likely use LPG more often and reserve gasoline as a backup. Refueling stops may be more frequent than with a fuel-efficient diesel, but overall fuel costs should be lower.
Common Mistakes to Avoid
One common mistake is simply forgetting to use the LPG system. To achieve the advertised savings of around €3 per 100 km, drivers necessitate to actively utilize the LPG fuel. Leaving the system on gasoline out of habit or avoiding the LPG station will negate the economic benefits of the Symbioz.
Another pitfall is neglecting the specific maintenance requirements. An LPG vehicle requires attention to the ignition system, with spark plugs and coils working harder due to the gas’s ignition properties. Regularly replacing spark plugs – typically between 30,000 km and 60,000 km – is crucial to avoid misfires and increased fuel consumption.
Key areas to monitor include:
- Persistent gas odor after refueling: check for leaks.
- Hesitation or rough running only on LPG: diagnose filters or injectors.
- Longer starting times when cold: normal when starting on gasoline, but abnormal if persistent.
- Check engine light after fuel switching: often related to the ignition system.
- Increased LPG consumption: clogged filters, gas pressure issues, or aggressive driving.
Finally, if you’re deciding between the Renault Symbioz Eco-G 120 and the Renault Symbioz E-Tech 160, consider your driving habits. If you drive more than 20,000 km per year, the LPG model may be more economical. However, if you primarily drive in the city or make short trips, a full hybrid might be a simpler and more convenient option.
