Twenty-Car Spanish Pilot Tests Drop-In Renewable Gasoline in Unmodified Engines

A fleet of about 20 Toyota and BMW cars is running in Spain on nothing but 100% renewable gasoline, under a six-month pilot announced on July 15, 2026 by BMW Group, Toyota Motor Europe, Bosch and Repsol.

The fuel is Repsol Nexa 95. Repsol says the gasoline delivers a net CO2 emissions reduction of more than 70% over the fuel life cycle compared with conventional gasoline.

The cars are series-production vehicles already on the road, not prototypes built for the test. Bosch supplies the technology for digital tracing of the fuel across the fleet.

That design choice is the substance of the experiment. Nexa 95 is produced from renewable feedstocks including residues and waste oils. According to the producer, it was engineered for use in ordinary compatible gasoline vehicles without substantial engine modification, which makes it a drop-in renewable fuel.

The stated objective is to verify under real driving conditions whether renewable gasoline can be used in existing vehicles, while trialling digital systems for tracing and certifying the fuel and collecting usage data across fleets.

Certification is the harder half of the problem. A molecule that behaves identically to fossil gasoline at the pump and in the cylinder cannot be distinguished by the engine, so any credit for its lower life-cycle emissions depends on a chain of custody that auditors accept. The Bosch tracing layer is being tested alongside the fuel itself, not after it.

The regulatory frame matters for reading the pilot. European rules apply mainly to CO2 emission targets for new cars and new light commercial vehicles placed on the market by manufacturers, according to Il Corriere Nazionale. The publication also notes that 2035 does not amount to a general ban on using gasoline or diesel cars that already exist.

That distinction defines the addressable market for a drop-in fuel. Vehicles already sold fall outside manufacturer fleet targets, and their tailpipes are unaffected by the composition rules governing new models. A liquid that lowers the life-cycle carbon of that installed base without touching the hardware is a separate decarbonisation route from electrification, and it competes for the same renewable feedstock and renewable electricity.

Renewable gasoline made from residues and waste oils sits in a different production category from e-fuels. E-fuels, or renewable synthetic fuels, are made through synthesis processes generally using hydrogen obtained with electricity from renewable sources and carbon dioxide captured from the atmosphere or other sources, per Il Corriere Nazionale. The same account stresses that hydrogen is not a primary energy source but an energy carrier, produced by water electrolysis using renewable electricity.

The practical difference is input scarcity. A waste-oil and residue route is bounded by collectable feedstock volumes; a synthesis route is bounded by renewable electricity and captured CO2. Both compete against battery electric vehicles for the same clean electrons, but only one of them can be poured into a car built years ago.

At roughly 20 vehicles over six months, the Spanish trial is a proof of concept rather than a supply signal. What it can produce is operational evidence on two questions that block scale-up: whether unmodified engines tolerate the fuel across real duty cycles, and whether a digital tracing system can substantiate a life-cycle claim of the size Repsol states.

The pilot was described a month after its announcement in coverage published on August 15, 2026 by New Media European Press and, under the byline of Maria Angela Amato, by Il Corriere Nazionale.