Mercedes-Benz GLA250 vs Denza B5

What's the difference?

Buuuuuuuur, parp, buuuuuuuuuuuur, parp. Anyone who knows anything about cars immediately recognises the sound of a 45-engined A-class derivative. It's the sound you hear in a tunnel as old mate blasts past with a giant carbon-fibre wing atop his hatchback. It's the sound you hear at 3:00am on a summer morning (if your suburb has no speed bumps, of course).

In short, that sound means big power from a 2.0-litre turbocharged engine, a seven-speed transmission, and a bunch of Germans who clearly had a sense of humour in charge of tuning the exhaust note.

Sure, the GLA compact SUV is probably a slightly unexpected source of all that noise. But then, Merc's Ingolstadt rivals stuffed Audi's stupendous five-cylinder engine into a Q3 to make the hugely improbable RSQ3, so why not do the same with their skirts-lifted A-Class?

To be honest, my expectations for this car were low. So do I owe Mercedes a grovelling apology? Or can I still claim the moral high ground after a week of GLA 45 "ownership"?

The Denza B5 Leopard PHEV is the latest in China’s plug-in hybrid invasion of Australia.

Denza is a premium sub-brand of BYD and the B5 is a luxury body-on-frame 4WD wagon with five seats, 16 drive modes, a low-range gear-set on the rear axle, and front and rear diff locks.

It has a packed standard features list, a premium-style interior, about 100km electric-only driving range, and real off-road adventure potential.

But how does this plush plug-in perform off-road?

Read on.