Tesla has been working hard over the past couple years to push battery technology to new levels. At the moment, the Model S is capable of getting 355 miles (572 kilometers). Two adventurous Tesla fans decided to test that out and broke that number by a whopping 186 miles.

The two drivers, Steven Peeters and Joeri Cools, decided to embark on a mission to see how far they could drive Peeters’ Model S by hypermiling. If you haven’t heard of hypermiling, it is the practice of trying to extract the most distance off a EV through multiple conserving methods.

With the A/C shut off, they managed to drive the Model S 560 miles (901.2 kilometers) on a single charge.

The trek the drivers used was a 16 mile (26 kilometers) loop in Belgium. It lasted a total of 23 hours and 45 minutes and they say it was “like sitting in hell and the sun was really burning” in a blog post chronicling their journey. According to them, at one point, the temperature inside the car reached 95 degrees Fahrenheit (35 degrees Celsius).

Sounds like a torturous experience, but they completed it nonetheless.

After the journey, Peeters wondered in his blog post if possibly the 100D could get better range due to the modified rear motors that are more efficient and weigh less. This thought was shared by Tesla CEO Elon Musk.

Responding to Electrek’s coverage of the story, Elon Musk revealed that a 100D Model S can possibly reach 621 miles (1,000 kilometers) with the right tires. Anybody with a 100D Model S care to try this theory out?