After ten years in the petrochemical industry, Marc Guillemaud and Augustin Roulleaux Dugage (Class of 2012, Energy and Processes / Energy and Products) founded the start-up FacteurDix in 2024.
The two met on the Rueil-Malmaison campus, driven by a shared conviction: to address the new challenges of mobility by reducing the environmental impact of vehicles.
After working together at ExxonMobil, they set themselves a clear objective: to design and market an electric vehicle that consumes ten times less energy than a conventional combustion car.
LINE: a futuristic prototype
In early July 2025, their vision took form with the launch of LINE (Light is Not Enough).
This two-seater electric vehicle (category L5e, pending approval) is designed for both city and highway driving. Compact in size (3.93 m long, 1.70 m wide, 1.22 m high), its sleek aerodynamic lines give it a distinctly futuristic look, worthy of the boldest innovations.
A design built for performance
To achieve high performance, Marc and Augustin collaborated with Florent Biard and partnered with the engineering firms Faster and Technomap.
Drawing inspiration from aerospace and motorsport, they optimized three levers: weight, aerodynamics, and frontal area. Using carbon fiber composites (PRFC), they kept the weight below 500 kg. The design features a “drop” shape with twin rear wheels, a compact 90-liter trunk, and two slightly offset seats.
Strong involvement from IFP School students
Students from the Powertrain Engineering (PWT) and Energy and Powertrains (MOT) programs contributed to the design of LINE through their final-year projects.
In the context of their final-year projects, Liwei He, Dante Maria Modesti and Louis Bernaert from the PWT program worked on the design of a lightweight electric two-seater vehicle. Supervised by Marc Guillemaud and Stéphane Rimaux, Systems Engineer at Stellantis, they presented their project “Energy-efficient mobility in extra-urban areas: an innovative approach” during the Student Challenge organized by the Société des ingénieurs de l’automobile (SIA), where they won 2nd prize!
Students in the Class of 2024 explored an additional topic: the design of a battery for a two-seater vehicle aimed at achieving the lowest possible energy consumption.
In 2025, students from the Energy and Powertrains (MOT) program worked on the pre-sizing of the vehicle’s powertrain and thermal management systems, with the goal of confirming the projected consumption targets for the LINE project through simulation.
The students’ work also made it possible to review available technologies on the market for this type of vehicle, as well as to study record-breaking ultra-efficient vehicles.
The LINE project fully embodies the strong relationship that connects our alumni with the School and its students.
Objective: Optimal Efficiency
The team is currently fine-tuning the battery and motor. The goal: to reduce the aerodynamic drag coefficient (CdA) to 0.28 m², achieve a range of over 500 km at a speed of 130 km/h, and reach 80% charge in just ten minutes. To achieve this, FacteurDix is seeking a partner in the battery sector.
The engine will have a power output of 50 kW, similar to that of a Lotus Elise.
Safety and Comfort
While the LINE model focuses on essential equipment to maximize energy efficiency, safety remains an absolute priority. The vehicle includes front airbags, ABS/ESP systems, and passive safety features (crash boxes, side impact zones). Its carbon fiber CFRP structure also ensures ideal rigidity for high-speed driving.
Comfort has not been overlooked: air conditioning, heating, and an onboard multimedia system are all included.
Next Step: A Record in Energy Efficiency
With LINE, Marc and Augustin aim to set a record for energy efficiency in 2027, targeting consumption of just 4 kWh/100 km (WLTP cycle), compared with 15–25 kWh for standard electric vehicles!
Based in Saint-Romain de Colbosc (Seine-Maritime), the team is preparing a limited micro-series of 100% carbon fiber prototypes, customizable starting in 2027. Industrial production is planned from 2030, with a market price of €35,000 per vehicle.
If you’re interested in the LINE project, please contact Marc Guillemaud: marc.guillemaud@facteurdix.com.
Article written by Meyling Siu