Jay Leno is one of the world’s most famous car collectors.

From rare concept cars to limited-editions supercars, he’s owned them all.

And there’s one car in particular that literally no one else in the world has.

The car in question is called the EcoJet, and it was built by General Motors in partnership with one of the world’s largest aluminum producers, Alcoa.

This car is unique in that it was designed for, and by, Jay Leno himself.

After buying so many cars made by others, Jay Leno wanted to build his own supercar.

He teamed up with General Motors and that’s how the EcoJet was born.

The EcoJet has a lot of features you won’t find anywhere else.

For starters, it is powered by a gas turbine that runs on biodiesel fuel.

This powertrain has a more in common with the engine of a helicopter than it does with the engine of any other supercar.

It produces 650 horsepower and generates 583 ft-lb of torque.

Leno didn’t provide official performance figures for this car but one thing’s for sure, it ain’t slow.

The attention to detail doesn’t end with the powertrain, though.

The body panels are made from a combination of aluminum and carbon fiber, and the EcoJet has two tanks.

One contains biodiesel, but it can also run on soybean oil, whereas the other contains kerosene.

And as for the infotainment system, it is based on Microsoft Windows Vista – imagine that.

Only one unit was ever produced and Jay Leno still owns it.

With a net worth of around $600 million, he certainly doesn’t need to sell it.

And for that reason, this car is essentially priceless.