He currently holds the Nürburgring Nordschleife lap record in the GT3-class with a time of 7:50.370 which he set in a Konrad Motorsport Lamborghini Huracán GT3.

In 2012, after not racing for two years, Jefferies returned to action in FIA Formula Two halfway through the season with a best of fifth in wet conditions at Circuit de Spa-Francorchamps in Belgium.

In 2013 Jefferies made his debut in the American Firestone Indy Lights series with Bryan Herta Autosport at the Mid-Ohio Sports Car Course and finished seventh.

Jefferies dominated the first round at the Yas Marina Circuit by being fastest in all practice sessions, taking pole position and winning the race.

Round 2 was held at Dubai Autodrome, where again Jefferies was on pole in the Pro Class and won both races.

Jefferies continued his top form in his debut in the Lamborghini Super Trofeo Europe by setting the fastest time in official practice for the first round at Monza Circuit.

In August 2017 Jefferies completed his second 24-hour long race at the Algarve International Circuit, again with GP Extreme in the Renault R.S.

The team qualified second and were sitting in the top 3 for the first twelve hours before a mechanical fault dropped them to an eventual eighth place finish overall.

January 2020 kicked off on a high with Axcil Jefferies taking the wheel of the Toksport WRT Mercedes AMG GT3 for the Dubai 24 hour race.

Taking the start of the race, Axcil made up five positions on track before handing the car over to Martin Konrad in P3.

Axcil shared the #36 Porsche 911 GT3-R with Mathieu Jaminet, Julien Andlauer, Frédéric Fatien and Alain Ferté.

Konrad Motorsport also fielded Axcil in the 24 Hours of Nürburgring race alongside Marco Mapelli, Michele Di Martino and Michael Lyons.

FIA World Endurance Championship In 2023, Jefferies landed a seat with Northwest AMR's GTE Am class entry alongside Paul Dalla Lana and Nicki Thiim.