Biggest carmaker

2012 Toyota Camrys are seen on a sales lot on November 9, 2011 in Miami, FloridaImage copyright Getty Images
Image caption Toyota held the top spot in global vehicle sales for four years in a row, until 2016, when it was pipped at the post by the Volkswagen Group

The biggest carmakers on the planet are posting their sales numbers for 2017 - so who is officially ranked number one?

Is it Germany's Volkswagen Group - which knocked Toyota off the top spot in the 2016 figures?

Or one of the newer conglomerates which encompasses several car companies?

Perhaps the US titan, General Motors, has fought back?

The answer: well, it depends on what carmakers include in their global sales numbers. And, crucially, how you define a car.

Confusing

Claiming the honour this year is a new player: the Renault-Nissan-Mitsubishi alliance.

The Japanese-French group acquired Mitsubishi in 2016 and adopted its current name in September last year.

Image copyright Getty Images
Image caption Carlos Ghosn heads up the newly formed Renault-Nissan-Mitsubishi alliance

It's made up of ten brands, including Dacia, Datsun, Infiniti and Renault Samsung Motors. Combined, the firm says that with its 10.61 million passenger cars and light commercial vehicles sold in 2017, it has become "the number-one automotive group worldwide".

But that's a bit confusing.

Why? Because Volkswagen says it sold 10.74 million vehicles in 2017 - and some say those numbers should see it named the biggest of them all, for a second year running.

A heavy conversation

Working out who's top dog in car sales globally really depends on what kind of ranking you want, according to Anna-Marie Baisden, head of automobiles at BMI Research in London.

Some media reports have put the Renault-Nissan-Mitsubishi alliance as "the biggest seller of light vehicles" in 2017, and placed VW firmly in second place.

But those accounts stripped out so-called heavy vehicles from VW's numbers.

Heavy vehicles usually mean things like big trucks and buses - which seems reasonable. They are clearly not cars.

But VW includes its heavy vehicles in its global sales numbers. And so others took those figures at face value, and reported the German firm had maintained the number one crown, ahead of the Renault-Nissan-Mitsubishi alliance.

Just to add to the confusion, carmakers and countries have varying definitions of light and heavy vehicles.

Take the very popular SUV - or sports utility vehicle. Is it a light truck or a car?

Image copyright Getty Images
Image caption In the US and Canada some SUVs are counted as light trucks. But in most of Europe and in China they are counted as passenger cars

Well that depends on where you live and what brand you're driving.

"SUVs have become very popular, so many of them are basically the same as normal cars," says Derryn Wong, editor-in-chief of CarBuyer.

"But in the USA some SUVs are counted as light trucks. In Singapore, Malaysia and Thailand, the Toyota Hilux is a pickup truck, or light commercial vehicle, while the Toyota Fortuner uses the same platform and looks similar, but is considered an SUV-passenger car.

"Simply put, it's very hard to draw a line where passenger cars end and light vehicles begin," he says.

But the fun doesn't end there.

Vans for example are nearly always counted as commercial vehicles, except if they are a minivan - like the Toyota Sienna, which can carry eight people.

Image copyright Getty Images
Image caption In the US, Canada and Russia the term light vehicle includes light trucks, like pickups

Also ranked as light trucks are pickups, like the Chevrolet Silverado, regardless of whether they are used for business or private transport.

"To cut through this, you could extract passenger car only data as defined by the makers themselves - but you'd have to do it for each conglomerate and their brands," says Mr Wong.

"But not every brand has published their total sales breakdown for 2017, and also not every brand clearly delineates passenger car and light vehicles."

So what's the answer?

Stripping out heavier trucks and buses from sales numbers would help you compare just the light vehicle market, says BMI's Ms Baisden,

"This would probably be more relevant to the average consumer, and this is where we would see the Renault-Nissan Alliance climbing the rankings," she says.

"The acquisition of Mitsubishi in 2016 means they now have a lot more light vehicles to include and so it is not unthinkable that they would be top based on the combination of all brands.

Image copyright Getty Images
Image caption Germany's VW Group includes subsidiaries like Audi, Porsche, Skoda Auto, and the truckmaker Man

"But if you included every brand in a group, and all of the types of vehicles sold, this would start to favour a company like the VW Group, which has everything from small hatchbacks, VW and Seat, through to premium with Porsche, and up to big trucks under the Man brand."

If neither of those options tickles your fancy, however, the OICA (Organisation Internationale des Constructeurs d'Automobiles) is one of the best sites for global vehicle sales rankings.

But it includes passenger cars, light commercial vehicles, minibuses, trucks, buses and coaches in their figures. And it hasn't released its rankings for 2017 just yet.

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