America’s 7 Least Efficient Cars 2010 (Read: Hottest Supercars)

Sep 30, 2021 - By Chris Weiss

The auto world spends so much time and verbiage expounding upon the virtues of cutting emissions that it’s easy to forget the cars and trucks on the other end of the list. Actually it’s not that easy, because the least efficient cars in America are some of the sexiest, most luxurious and otherwise ostentatious four-wheelers that have ever graced American highways. So we decided to pay a little homage to the top 10 gas-guzzling sweethearts of the American auto industry. If you’re an ultra-wealthy megalomaniac set on destroying the world one chunk of ozone at a time, these are the most effective arrows in your quiver.

Lamborghini Murcielago (Manual Transmission)

Economy (City/Hwy): 8/13

Average Annual Cost at the Pump: $4,425

It’s no surprise that a 6.5-liter V12-powered beast like the Murcielago is the least efficient car on the road, but 8 and 13? Ouch. It’d probably take longer for you to dump a gallon of gas onto the street than it would for that giant, rear-mounted engine to suck it down. It’s no wonder Lamborghini chose to strip the interior of its Sesto Elemento concept and give it a full carbon fiber wardrobe. If you still pine for the Murcielago, you can gain 1 mpg in both highway and city by letting Lamborghini do the shifting for you.

Bugatti Veyron 16.4

Fuel Economy: 8/14 mpg

Average Annual Cost at the Pump: $4,425

World's Fastest Car: Bugatti Veyron Super Sport

Off the top of my head, I’d have thought the Bugatti Veyron would have been at the very top of this list, what with it’s gargantuan16-cylinder and 12-minute to empty bragging rights. However, it actually packs one extra mpg for highway driving than the Lambo, so it’s only the second least fuel efficient car on the block.  When you’re big brother is the fastest kid in the world, you can get away with being a little slovenly and inefficient.

Ferrari 612 Scaglietti (Automatic)

Fuel Economy: 9/16

Average Annual Cost at the Pump: $4,022

Well, we’ve got Lamborghini and Bugatti, that means only one thing: Ferrari has got to be next. And the least efficient Prancing Horse on the roads is Ferrari’s four-seater: the 612 Scaglietti. The 612’s 5.7-liter V12 engine and six-speed automatic combine for a paltry 9 and 16 mpg. Then again, they also combine for 533 hp and 434 lb-ft of torque. And you’ll get to 60 mph long before your needle drops to empty-3.4 seconds to be exact. The manual version actually adds a city mpg but cuts a highway mpg, so you’re about the same whatever your preference.

Ferrari 599 GTB Fiorano

Fuel Economy: 11/15

Average Annual Cost at the Pump: $3,686

Dropping two seats and 400 lbs. helps the 599 GTB coax an extra two miles out of Ferrari’s 5.7-liter V12 engine. At least in the city; on the highway, the 599 actually loses mileages over the 612. But either way, it gets us out of the dire single-digit mark and on to brighter pastures. Plus its 620 horses and 3.7-second 0-to-62 mph time is something to smile about. Even if you’re killing penguins as you relish in it.

Bentley Azure/Brooklands

Fuel Economy: 9/15

Average Annual Cost at the Pump: $4,022

It doesn’t really matter how you take your 6.8-liter Bentley V8, it’s going to screw your wallet real hard. Whether you opt for the classic stability and styling of the Azure two-door or drop the hard-top for a contrasting soft-top, you’ll be pouring more than$4 grand into the pump each year. But you’ll also get 500 horses and over 180 mph of capability within an incomparably luxurious Bentley package.

Maybach 57/57S

Fuel Economy: 10/16

Average Annual Cost at the Pump: $3,686

Mercedes certainly wouldn’t let Volkswagen have all the fun (though with Lamborghini, Bugatti and Bentley dominating the top slots, it’s sure having a lot). The Maybach 57 coupe or convertible increase the economy ante ever-so-nominally over the Azure and Brookland. The 57 models also gain two extra doors over those Bentley models doors and feature 550 to 620 horses worth of V12 output.

Bentley Continental GT and GTC

Economy (City/Hwy): 10/17

Average Annual Cost at the Pump: $3,500

Like the Azure and Brooklands of last go, it doesn’t matter if you want your Continental GT in hard-top or convertible, 5,000 pounds of Bentley bulk and 550 horses worth of 6.0-liter W12 have a way of spewing emissions like your chain-smoking landlady. But there’s really no arguing with the Continental GT’s unparalleled combination of sportiness, performance, styling and luxury. The Bentley Continental Flying Spur also slots in right here.

Mercedes-Benz ML 63 AMG

Fuel Economy: 11/15

Average Annual Cost at the Pump: $3,686

You were waiting for an SUV weren’t you? The Mercedes ML 63 AMG combines all the high-bodied bulkiness of your everyday SUVs with all the big-engined performance of our previous models, so it’s no surprise it’s the least efficient SUV on the market. Using a tuned-up 503-hp 6.3-liter 8-cylinder, the Mercedez-Benz ML 63 AMG manages to stay well above the average every man SUV in terms of power, luxury and, of course, lack of efficiency.

The waters get a little murky after this. And not just because of the excessive acid rain caused by these overblown V10s and V12s, but because there are numerous cars tied for the next spots. For instance, at 11/17 there’s a deep, multi-way tie between such cars as the Aston Martin DBS and DB9 manuals, the BMW M6, Mercedes CL models and the BMW M5, plus others. For more numbers, find your car at