This engine, which is only available on SRi and Elite trims, isn't one of the new subdued 'Whisper' diesels used elsewhere in the range. Even so, it's mechanically smooth when you work it, and although it gets a bit boomy past 3000rpm, it’s not unpleasant to rev out. The only issue is some vibration through the controls at around 2500rpm and at idle.
It performs well, though. The two turbos are differently sized; there's a smaller one for quicker low-end response and a larger one for extra surge at higher revs. The upshot is good pick up from 1500rpm through to 4000rpm, at which point it feels spent. Initial response is no more tardy than that of the lower-powered diesel, which is something that can't be said for some high-output versions of the single-turbo diesels in competitors' cars.
The six-speed manual is not the most precise gearbox we’ve tried, but it’s light and the ratios feel well spread. For cruising, the leggy sixth gear keeps the engine quiet, and when travelling at motorway speeds road and wind noise was pretty hushed, too.
On twistier sections of road, the Sports Tourer’s decent dynamics come into play. The springs are firm enough to keep body roll well checked, and the damping – no doubt aided by the reduced weight – is nicely judged to remove any extreme vertical movement, even on undulating sections.
The nose turns in sharply, but the steering could do with more sparkle to tell you what the front tyres are up to. The Astra's woolly brake pedal, while ultimately effective at stopping you, lets down what's clearly a car that's had some engineering budget thrown at it. This is frustrating because it feels like it wouldn't take much to shift this Astra from good to dynamically great.
Diesel Astras seem firmer and more prone to fidgeting over patchy roads than the petrols, and this version is no different. That said, it manages to keep the right side of the comfort line, smoothing out the worst of general lumps and bumps. But, as with other Astra Sports Tourers we've tried, the rear suspension can be noisy.
You get a fine driving position with loads of adjustment, although if you go for the SRi model, we’d recommend the optional lumbar adjustment (standard on the Elite), without which the seat backs feel a little flat.
The enlarged cabin pays dividends, offering enough space for four large adults, or five if the rear passengers don’t mind some thigh rubbing, and the boot is a decent size. At 530 litres with the rear seats in place, it’s good enough for the annual family holiday, and at 1630 litres with the 40/60 split rear seats folded flat, it’ll manage less glamorous jobs like trips to the tip. Loading it is easy, thanks to the wide boot aperture and low floor height. It's just a shame there's no centre armrest or ski-flap available for longer items.
Like the hatchback, the new Sports Tourer feels more polished inside than before. The spread of buttons that were scattered across the dashboard of the old car have been replaced by thoughtfully grouped controls and a mostly fathomable infotainment system. Meanwhile, the use of plusher trims and chrome highlights help distance it from the likes of the Ford Focus, nudging it further towards Skoda's Octavia in terms of quality.