MERCEDES has a big range of electric cars. But I wouldn’t buy one yet.

They’re either inefficient because they are adapted petrol cars – the EQA, EQB and EQC.

Or they’re excellent but ultra-expensive – the EQE and EQS.

Never mind.

Merc has proved it’ll soon get on top of the electric car game.

We tried the stunning experimental concept saloon called EQXX and our electricity consumption equated to a 750-mile range from a SINGLE BATTERY CHARGE.

So it might only need plugging in once a month.

More good news.

It isn’t a mad professor science project.

It uses realistic and affordable technologies.

It also feels like a real car to drive.

Surprisingly fun, too, and not the boring eco-car you might imagine.

It sits low to the ground, accelerates like a warmish hatchback, and steers sharply with little body roll.

But it also glides smoothly along a dual-carriageway, taking advantage of its ultra-low drag.

Sadly, Merc won’t build a car exactly like this.

People mostly want crossovers, which are taller and use more energy, so get less range.

Even so, there’s an electric equivalent of the C-Class saloon on the way, and the engineers say lots of the EQXX’s tech and lessons will go into that car, due in about 2025.