The Buick LaCrosse Avenir is a $47,500 sedan that gives luxury SUVs a run for their money (GM)

The passenger-car business is collapsing in the US. The big, soft-cruising sedan was once the mainstay, the great American family car.

But now the great American car is actually an SUV. Sales of utes have boomed for years, and the automakers aren't complaining because they make hefty profits on these vehicles. Consumers like them better, and that has raised a conundrum: Are sedans worth keeping around?

If you're planning any family road trips in the future, you might want to give sedans a second look — and your first-second look should be a Buick. Specifically, the new premium Avenir trim level.

Recently, I drove my family of five and my dog on a 500-mile round-trip journey. Normally, I use trips such as these to sample big old SUVs, with three rows of seating. But a planning screwup on my part led to a 2018 Buick LaCrosse Avenir landing in my driveway instead of a Cadillac Escalade.

So we undertook a throwback family jaunt. And it worked out far better than expected.

Say hello to the Buick LaCrosse Avenir, an upmarket trim level of the full-size sedan. Debuted in 2005, the LaCrosse was updated in 2010 and then again in 2017.

It's not a small car, but Buicks always take some of the bulk off with smooth curves and sinuous shapes.

Our test car was a front-wheel-drive version that came in at $44,870 with many options and the Avenir treatment. A Driver Confidence package, featuring adaptive cruise control, auto braking, pedestrian warnings, and parking assist added $1,700 to the sticker, bringing the as-tested price up to about $47,500.

The paint job was "Dark Slate Metallic."

You could obviously call the styling a bit dull. Or you could say that the LaCrosse isn't showing off.

The roofline slopes rakishly to the trunk decklid, ending in a spoiler lip.

Overall, the sedan is pleasantly sleek, wearing its size like a well-tailored suit.

Thankfully, Buick ditched the abstract chrome tri-shield badge and brought back the tri-colored design.

The tail lights and headlamps are marvelously balanced, which is something you can't say of every luxury car.

The ventiports are a Buick trademark, but they're fake — they don't ventilate the engine.

We've endured a challenging winter on the East Coast, so I took the opportunity to open the sunroof and let the actual sunlight in.

Oh where have you been, blue sky and glowing orb in the heavens?

The interior was a comfy two-tone: black and chestnut leather.

Some pretty premium woodgrain. Some of the best I've seen, actually, in a car that doesn't have a German, Swedish, or English heritage.

Some Avenir branding, which isn't terribly obtrusive.

For the driver, the view is straightforward. The steering wheel is heated and leather-wrapped, and the instrument cluster is an analog-digital blend, with small informational screens that can display data. A head-up display is also available.

The joystick-style shifter is irritating. Easy to use once you get the hang of it, but there were a few times when I thought I was in reverse only to find myself in drive.

The power from the 310-horsepower, 3.6-liter V6 is piped through a pleasant nine-speed automatic that can be dropped into manual mode and shifted old-school via the paddles behind the steering wheel.

This is a darn good motor, continuing a long tradition of great V6's at GM and Buick. Fuel economy is reasonable: 21 mpg city/30 highway/24 combined.

The capacious back seat swallowed a 15-year-old, a 12-year-old, and a 7-year-old.

The front seats, by the way, are both heated and cooled.

The truck provides a considerable 15 cubic feet of cargo space. That was more than enough for the family's luggage, including dog treats and my worst and smallest acoustic guitar.

The Buick's IntelliLink infotainment system is excellent. It supports Apple CarPlay and Android Auto and through OnStar provides a 4GLTE wifi connection.

Bluetooth device pairing was a snap, and the Bose Centerpoint Surround Sound audio system proved itself yet again — Bose was our Car Audio System of the Year award winner at Business Insider in 2017.

You have all the usual USB/AUX connections, and a nice extra in the rear seat area: a proper plug to charge gadgets.

The GPS navigation system seamlessly guided us from New Jersey to Maryland and back.

So what's the verdict?

I'm a LaCrosse fan and have been for a while. Pre-Avenir, I sampled a similarly well-equipped sedan and came away with positive impressions.

The Buick LaCrosse Avenir is a $47,500 sedan that gives luxury SUVs a run for their money (GM)

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