Plug-in hybrids have long been marketed as offering the best of both worlds, combining the reliability of a combustion engine for long trips with battery efficiency for daily commutes. However, actual usage patterns often diverge from this promise, with many drivers rarely charging their vehicles and relying on gasoline for weeks at a time as if operating a purely thermal model. To address this behavior, the European association Transport & Environment (T&E) has proposed a radical measure: limiting fuel tanks in these vehicles to a maximum of 15 liters.
Data collected by T&E indicates that real-world emissions from these vehicles can reach six times higher than their officially homologated values. This issue is particularly acute within corporate fleets, where drivers utilizing company-paid fuel cards frequently ignore charging cables stored in the trunk. The association's proposal does not aim to ban plug-in hybrids but rather to alter fiscal rules and incentives. To qualify for public benefits or eco-labels, manufacturers would be required to limit fuel capacity to 15 liters while simultaneously guaranteeing at least 200 kilometers of real-world electric range and DC fast charging capabilities exceeding 100 kW.
Under this framework, the gasoline-only range would drop to approximately 150 or 200 kilometers once the battery is depleted. Drivers who refuse to charge their vehicles would be forced to stop at fuel stations every two days. The logic behind the proposal is to create a practical inconvenience significant enough to make plugging in the most convenient option for users.
Despite the intention to enforce cleaner habits, experts warn of potential complications. Limiting the fuel tank may not guarantee increased time connected to electric charging points; instead, it could result in longer queues at gas stations and frequent visits to top up with small quantities. Furthermore, installing batteries capable of delivering 200 kilometers of range would significantly increase vehicle weight and final sales prices. A plug-in hybrid with such capacity would approach the costs and environmental footprint of a fully electric vehicle, potentially undermining its economic rationale. Manufacturers would also need to redesign entire platforms to accommodate larger cells without sacrificing trunk space.
The discussion is currently taking place in Brussels and remains a point of contention among stakeholders. At this stage, the proposal stands as a technical recommendation from T&E rather than an official European Union directive. Nevertheless, it serves as a serious warning to the automotive industry that the strategy of selling heavy hybrids to meet paper targets may be nearing its end.
Sources: Pplware.