Fleet-footed: New VW Golf GTE meets £35k PHEV rivals

It’s certainly a varied field. But while these three cars may differ in shape and size, they all have one thing in common: a plug-in hybrid powertrain.

Short of going for a full-on electric car, for company car drivers, plug-in hybrids are the most tax-efficient form of four-wheeled personal transport. Their smaller batteries and electric motors mean they can cover shorter distances without emitting anything from their tailpipes, and their small-capacity petrol engines are ready to step in on long-haul trips. The more electric range a PHEV has, the less fuel it will use and the lower its average CO2 emissions will be. And, of course, less CO2 means less BIK taxation. You know how it works.

Given the fact that such a considerable chunk of a PHEV’s appeal lies in its on-paper cost-benefit analysis appeal, I suppose we should crunch some numbers first.

In terms of electric range, it’s the CLA that comes out on top. Mercedes claims its 15.6kWh battery (10.6kWh of which is usable) is good for a maximum zero-emissions range of up to 44 miles, which combines with average CO2 emissions of 23g/km for a BIK rating of just 6%. So with a P11D of £37,395, the CLA will cost someone who falls into the 20% income tax bracket £37.40 per month and £74.79 per month for someone in the 40% bracket.

The Golf is similarly impressive. The claimed 39.7-mile range afforded by its 13.0kWh battery isn’t quite as good, but it still slots into the 6% BIK bracket by the skin of its teeth. A P11D of £35,905 means that someone on the 20% tax rate will pay £35.91 per month in company car tax, and it’s £71.81 for those taxed at 40%.

Compared with your average diesel or petrol car, the 508 is still phenomenally tax-friendly, but it doesn’t quite stack up against its rivals here. With a claimed electric range of between 33 and 39 miles from its 11.8kWh battery and CO2 emissions of 29g/km, it misses out on that 6% BIK rating and instead falls into the 10% bracket. So it will cost £56.83 per month at 20% and £113.65 at 40%. And, just to put this all into context, a humble, £36,130 BMW 318d M Sport would cost £168.53 or £337.05 per month, depending on your income tax bracket. That’s quite a jump.

So of our trio, it’s the Golf that’s likely to be the cheapest to run, and it’s tempting at this point to simply label the Volkswagen the winner and be done with it. After all, that’s really what these cars are all about, right? Minimising tax expenditure? The cynic in me says it is, but surely there is some scope for driver enjoyment here, too? Let’s find out.

In terms of outright ride comfort – important if you spend a lot of time on the motorway – it’s the Peugeot that gets the nod. Its longer wheelbase, softer suspension set-up and optional adaptive dampers with their comfort setting all contribute to a ride that feels impressively cushioned and confidently controlled, even on particularly lumpy stretches of road.

It doesn’t shudder too violently or noisily over bumps at lower speeds, either, and its cabin looks and feels suitably snazzy and well-made – although the low-set, small-diameter steering wheel might not be to everyone’s taste. For what it’s worth, I quite like the go-kart-like driving position this car affords.

The powertrain is nicely refined, too. There’s decent urgency and responsiveness when you’re rolling around on electricity, and its 1.6-litre turbo petrol engine is smooth and quiet when it does spark into life. Even with a combined output of 222bhp, its 1720kg kerb weight means it doesn’t feel outstandingly rapid, but it’s easily swift enough for stress-free real-world use.

That said, the Peugeot doesn’t always change gears with a great sense of urgency, and its brake pedal can feel very spongy, so there’s limited driver appeal here. But this is nonetheless a likeable, easy-going car that’s generally relaxing to tool about in. It’s spacious, too, with generous rear leg room and a 487-litre boot – the largest one here by a considerable margin.

In terms of set-up, the Mercedes follows the Peugeot’s soufflé-like lead – only its execution isn’t as successful. There’s a sponginess to the ride quality that appeals at first, but put a good amount of pace on and that vertical body movement soon begins to feel a bit too unchecked. It just doesn’t feel as controlled as the 508, and an occasionally abrupt and noisy secondary ride doesn’t win the CLA much favour either

Neither does its powertrain. Yes, the Mercedes has the best claimed electric range here, and it runs smoothly when operated as such. But its 1.3-litre turbo petrol engine really feels out of its depth in terms of mechanical refinement; on an open throttle, it’s not only loud but harsh-sounding too. And with a transmission that seems intent on quickly downshifting whenever you go near the throttle, you’re exposed to that din more often than you would like.