Ford Motor Co. has added another plug-in hybrid passenger car to its growing fleet of alternative fuel vehicles. It’s a Fusion Platinum Energi, which joins Ford’s Fusion, C-Max and Focus family of fully or partly electrified vehicles. Taking the company’s hybrid effort to a new level of luxury, it’s now the leading edge of a fleet of 13 new electrics Ford says it will put on the road by 2020.

Ford boasts that the Platinum Energi’s 610-mile combined gas and battery power range, up from 550 miles on the 2016 model, is the industry’s highest.

Ford says the Energi can travel 21 miles on battery electric power before the gasoline engine kicks in. An overnight plug-in is required to bring it back to full power.

The industry pitch on hybrids is simple: You can drive around on battery power, and cover most of your driving needs, then recharge while your car sits idle at work or at home.

But, unlike battery electric vehicles such as those made by Tesla, the hybrid can be gassed up and run on a traditional engine when needed for longer drives. So, the pitch goes, they offer all the green, gas-free pleasures of electric, with the range-anxiety-reducing reassurance of gas.

But hybrids, like plug-in electrics, don’t sell very well. Fewer than 3 percent of all vehicles sold in the U.S. last year were anything other than traditional powertrain vehicles burning fossil fuels.

So hybrids are priced accordingly, like the special-interest, niche vehicles they are. An entry-level, gasoline-powered Fusion, which gets up to 32 mpg on the highway, starts as low as $22,985. A hybrid version of the base-level car gets up to 43 mpg in highway miles and costs $26,060. Plug-in Fusions, offering fuel efficiency of over 100 mpg, start at $31,995.

The Platinum Energi, which offers an estimated 104 mpg in the city and 91 on the highway, starts a little higher at $37,995. Add a few luxury items and you’re close to $40,000.

To be fair, Ford’s top-drawer PHEV does feel like a luxury car. It’s plush and quiet, around town and on the freeway — so quiet that I often wasn’t aware whether I was in gasoline or electric mode.

The Energi’s handling is somewhere between stately and stodgy — this isn’t a zippy car — and the acceleration is well-suited for sensible, adult driving.

Creature comforts abound. The cushy front seats, which are heated and cooled, have a snug, sporty feel. The back seats, though not offering massive leg room, are Mercedes-level plush. The “white platinum MET Tri-coat” paint job, a $595 extra, is luscious. Why, the cupholders even light up, in delicate blue tones, when the front doors are opened.

The dash and console area are clear and uncluttered. Ford — like Fiat Chrysler, Cadillac and some other brands — has eliminated the traditional gear shift arm on the steering column and replaced it with a rotary transmission dial in the center console.

The infotainment system is intelligently designed and displayed. It synced up easily with my iPhone — not all systems do — and felt intuitive as I negotiated my way through entertainment, climate control, navigation and communication screens.

The Platinum Energi also comes standard with what Ford calls “Enhanced Active Park Assist.” This system asks the driver to indicate he’s looking for a parallel parking place, and then allows the car to find one and get into it with only accelerator and brake pedal input from the driver.

The Energi doesn’t come with two things that I would miss: trunk space and a spare tire. Like most plug-in hybrids, the Energi uses the rear storage area to house its large battery, which means this substantially sized vehicle won’t carry substantial luggage.

Ford already offers alternative powertrain options for several of its vehicles. You can get a Focus with a small 1-liter EcoBoost gas engine, or in an all-electric plug-in version. You can get a C-Max as a hybrid or a plug-in hybrid. You can get the Fusion the same way — as a hybrid or plug-in hybrid — or as an old-fashioned gas-burning vehicle, including a turbocharged V-6 version.

Customers are increasingly inclined toward the hybrids. With the Platinum Energi, getting there in a plug-in hybrid is just a little more plush.