For more than a year, Lexus has suggested that the LS 600h L — as tested, a $121,000 hybrid version of its LS 460 L flagship sedan — would set a new standard for four-door luxury automobiles. Its pitch was that the car would perform like a V-12 supersedan while whipping V-8 rivals on fuel economy. Instead, the hybrid may have set a new standard for automotive hyperbole.
Behind its green Teflon shield, the Lexus proved to be just another overstuffed sedan that can barely top 20 miles a gallon — less, if you actually tap into all that power. If that’s saving the planet, Jor-El had better prepare the escape pod before it’s too late.

I can’t believe that adding a cupful of electric juice to a fat barrel of V-8 muscle is what environmentalists have in mind.
On the performance front, forget about the Lexus hanging with V-12 sedans like the Mercedes S600. Turns out that the Lexus can’t even outrun its own nonhybrid version, the LS 460 L. Nor is it appreciably quicker than V-8 competitors that cost $20,000 to $30,000 less, like the Mercedes S550, the Audi A8 and the BMW 7 Series, or the similarly priced Maserati Quattroporte.

It must be noted that such decadent sedans are about more than straight-line speed. Park those high-wattage rivals beside the Lexus, and the modestly styled LS virtually disappears; challenge them on a twisty road and they all disappear from the Lexus by virtue of their sportier handling.

Spurred from a stop to 60 miles an hour, the LS 600h L clocks a swift 5.5 seconds, according to Lexus’s own testing. Yet the gas-only LS 460 L, with a mere 380 horsepower from a smaller V-8, reaches 60 in 5.4 seconds, nosing out the more powerful hybrid.

How is that possible? Check the scales, where the Lexus hybrid weighs in like Jared before his Subway diet.

Excess weight takes its toll on mileage as well. The hybrid got 21 m.p.g. — amazingly, 1 m.p.g. less than the nonhybrid version that I tested on the same urban roads and highways in and around New York City.
Driven gently, the Lexus will indeed beat the mileage of its apples-to-apples V-8 rivals, but only by 1 m.p.g. to 3 m.p.g. A Mercedes S550 isn’t an egregious guzzler at an E.P.A.-rated 16/24 m.p.g., and I managed 19 m.p.g. during a recent test. And when I drove the Lexus in mildly spirited fashion, its mileage dropped to 19 m.p.g. It’s hard to see why such minuscule mileage gains would dazzle the type of person who’s ready to drop $100,000 on a car.

The uneasy comparisons don’t end there. The gas-only version handled better and drove more smoothly.
The nonhybrid benefits from the world’s first eight-speed automatic transmission, which lifts mileage and operates with hushed aplomb. The hybrid’s continuously variable transmission, in contrast, has to busily calculate and divvy power from the gas and electric sources. It’s among the most seamless of its kind, but not as smooth or transparent as the Lexus eight-speed. And its manual-shift function is nearly useless. In trying to mimic the feel of sporty downshifts, it ladles on ever-higher levels of regenerative hybrid braking. To the driver, the sludgy effect feels like throwing anchors of various sizes out the window.

Lexus’s hybrid double-talk extends to emissions arguments. When the company says the Lexus hybrid is cleaner than average cars, people will assume that has something to do with global warming. But in this instance, that is not the case.

To its credit, the car’s super-ultra-low emissions vehicle rating (SULEV, if you will) is indeed cleaner than other V-8 models, but only if you are measuring the pollutants that form smog. (Even on the smog index, many gasoline models also achieve SULEV ratings or better).

But the critical earth issue today is conserving fuel and cutting carbon dioxide emissions. Those greenhouse gas levels are almost entirely a function of fuel economy: if you use more gas, you spew more carbon dioxide. So on that score, the 21 m.p.g. hybrid actually emits far more carbon dioxide than, say, a Mercedes-Benz diesel E-Class that can attain 30 m.p.g.

The LS 600h L also emits more greenhouse gases than the average new car that currently achieves 27.5 m.p.g. So a common Toyota Camry, among dozens of models, leaves a smaller carbon footprint than this hybrid land yacht.

One final ignominy: given the hybrid batteries and a separate air-conditioner for the back seat, the hybrid’s trunk measures a meager 11.7 cubic feet, smaller than that of a Kia Rio or other compact sedan. (Skip the rear air-conditioning in a Lexus LS 460 L, and you’ll enjoy a 50 percent larger trunk, at 18 cubic feet).

So why would anyone spend an extra $30,000 for this car? Certainly, the performance gains of 12-cylinder sedans aren’t always justified by their enormous premiums. Many people buy them for that V-12 badge on the fender, the exclusive message it sends. Ditto for the Lexus, but the roughly 2,000 people who’ll line up for the hybrid won’t be broadcasting their superior power, but their superior morals, however illusory.