Why this petrol station had queues of cars waiting to fill up - but is it worth the wait?

Exactly how long would you be prepared to wait at the petrol station to fill up your tank?

For some bargain-hunting motorists in Perth, they were willing – if not necessarily happy – to line up for more than an hour to get the cheapest petrol in the city's northern suburbs.

Video has emerged from outside a Caltex petrol station in Mirrabooka showing a line snaking its way out from the fuel pumps with cars at least 15-deep from each bowser.

Peak hour at the petrol pump. Source: Edward Kinnane

The local Caltex was selling unleaded petrol for $1.087 a litre, while other outlets were selling for five to 10 cents extra – saving up to $8 on a full tank for the average family car.

"Gridlock," the man filming can be heard saying. "Gotta love it."

A fuel truck also patiently waits in line. Source: Edward Kinnane

It's twilight, peak hour at the petrol pump, and in more than a minute's worth of footage, there is barely any forward movement in the line.

Perth is known as a heavily car-reliant city, but is an hour-long wait really worth it?

Motorists queued more than an hour to get cheap petrol. Source: 7 News

When the footage was posted online, some users questioned how much fuel was actually being used to keep the motor running while waiting in an hour-long queue.

But this Mirrabooka station is known as a cheap fuel hotspot, so motorists keep flocking to it, despite the heavy demand and long wait.

And what happens when the petrol runs out?

As this footage shows, there's a massive fuel truck waiting to refill the pumps - if it can ever get to the front of the line.