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Worst offenders: The 16 least-efficient new cars and trucks

What do burly trucks, massive luxury sedans and svelte supercars have in common? Their embarrassingly low fuel economy estimates. We've rounded up the 16 worst offenders for the 2015 and 2016 model years.

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Antuan Goodwin

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1 of 32 Nick Miotke/Roadshow

Ram 1500 4WD: 15 mpg

US EPA mpg estimates:

City: 13 mpg

Highway: 19 mpg

Combined: 15 mpg

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2 of 32 Nick Miotke/Roadshow

Ram 1500 4WD: 15 mpg

It's a big ol' truck, so it's no surprise to see the Ram 1500 make this list. Though the Ram is available with a reasonably efficient diesel option, the big Hemi V-8 with the 4x4 powertrain struggles to break 15 mpg.

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3 of 32 Fiat Chrysler Automobiles

Jeep Grand Cherokee SRT: 15 mpg

US EPA mpg estimates:

City: 13 mpg

Highway: 19 mpg

Combined: 15 mpg

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4 of 32 Fiat Chrysler Automobiles

Jeep Grand Cherokee SRT: 15 mpg

A Hemi V-8 outputting 475 horsepower is equally to blame for the fastest SUV in this class' low miles per gallon and high thrills per minute. Eco technologies keep the 6.4-liter's efficiency numbers on par with the smaller 5.7-liter in the Ram.

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5 of 32 Antuan Goodwin/Roadshow

Lexus LX 570: 15 mpg

US EPA mpg estimates:

City: 13 mpg

Highway: 18 mpg

Combined: 15 mpg

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6 of 32 Antuan Goodwin/Roadshow

Lexus LX 570: 15 mpg

The Lexus LX 570 is a massive SUV, but it's no soft-roader. The LX (and the mechanically identical Toyota Land Cruiser) makes up for its 13 city mpg with capable and competent off-road abilities.

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7 of 32 Antuan Goodwin/Roadshow

Dodge SRT Viper: 15 mpg

US EPA mpg estimates:

City: 12 mpg

Highway: 21 mpg

Combined: 15 mpg

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8 of 32 Antuan Goodwin/Roadshow

Dodge SRT Viper: 15 mpg

You knew this one was coming. The Viper is so notorious for its fuel inefficiency that Chrysler tried to spin it off into its own brand to keep from hurting Dodge's fleet mpg average. But a 3-second 0-60 time and 645 horsepower have me asking, "EP-who?"

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9 of 32 Roadshow/Carfection

Bentley Continental Flying Spur: 15 mpg

US EPA mpg estimates:

City: 12 mpg

Highway: 20 mpg

Combined: 15 mpg

Bentley Continental GT: 15 mpg
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10 of 32 Wayne Cunningham/Roadshow

Bentley Continental GT: 15 mpg

Bentley's Continental Flying Spur sedan and Continental GT super coupe actually boast fairly respectable 20 mpg highway economy averages, but these heavyweights' abysmal 12 mpg city estimates drag their combined averages down.

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11 of 32 Toyota

Toyota Sequoia: 14 mpg

US EPA mpg estimates:

City: 13 mpg

Highway: 17 mpg

Combined: 14 mpg

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12 of 32 Toyota

Toyota Sequoia: 14 mpg

The Toyota Sequoia cracks the 14 combined mpg mark when equipped with the big 5.7-liter V-8 engine and 4WD drivetrain. For those who need room for passengers but not the towing capacity, the much more efficient Highlander may be a better choice.

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13 of 32 Mercedes-Benz

Mercedes-AMG GLS 63: 14 mpg

US EPA mpg estimates:

City: 13 mpg

Highway: 17 mpg

Combined: 14 mpg

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14 of 32 Mercedes-Benz

Mercedes-AMG GLS 63: 14 mpg

Another massive luxury SUV, the Merc-AMG GLS 63 lags behind Audi SQ7's technology and fuel efficiency. The GLS is winning the horsepower arms race, however, with 585 hp on tap.

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15 of 32 Roo Lewis/Roadshow

Aston Martin V12 Vantage: 14 mpg

US EPA mpg estimates:

City: 12 mpg

Highway: 18 mpg

Combined: 14 mpg

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16 of 32 Roo Lewis/Roadshow

Aston Martin V12 Vantage: 14 mpg

An EPA estimated 12 city mpg is pretty much the only negative thing that we can find about the Aston Martin V12 Vantage. But with a snap of its throttle and a bark from its exhaust, all is forgiven.

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17 of 32 Rolls-Royce

Rolls-Royce Phantom: 14 mpg

US EPA mpg estimates:

City: 11 mpg

Highway: 19 mpg

Combined: 14 mpg

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18 of 32 Rolls-Royce

Rolls-Royce Phantom: 14 mpg

The Phantom Drophead Coupe is the most expensive Rolls-Royce on the market at nearly half a million dollars. Owners with that kind of dough are probably not concerned with only getting 11 city mpg.

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19 of 32 Josh Miller/Roadshow

Bentley Mulsanne: 13 mpg

US EPA mpg estimates:

City: 11 mpg

Highway: 18 mpg

Combined: 13 mpg

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20 of 32 Josh Miller/Roadshow

Bentley Mulsanne: 13 mpg

Bentley's Phantom-fighter has fewer cylinders (eight vs. 12), but the same displacement as the Rolls. It's also down one mpg for its highway and combined estimates. To make up, Mulsanne also adds a turbocharger to boost peak output to 505 hp.

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21 of 32 Roo Lewis/Roadshow

Pagani Huayra: 13 mpg

US EPA mpg estimates:

City: 11 mpg

Highway: 17 mpg

Combined: 13 mpg

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22 of 32 Roo Lewis/Roadshow

Pagani Huayra: 13 mpg

This $1.3 million hypercar makes 720 hp and over 800 pound-feet of torque. Fuel economy is the last thing on anyone's mind in the presence of this beast.

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23 of 32 General Motors

Chevrolet Express 3500: 12 mpg

US EPA mpg estimates:

City: 11 mpg

Highway: 16 mpg

Combined: 13 mpg

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24 of 32 General Motors

GMC Savana 3500: 12 mpg

From hyper cars and hyper luxury to a white panel van?! The GMC Savana 3500 and Chevrolet Express 3500 make the list with their combined 13 mpg estimates. To be fair, most of the 3500's competition avoid this list by classifying as heavy-duty vehicles.

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25 of 32 Roadshow

Ferrari F12 Berlinetta: 12 mpg

US EPA mpg estimates:

City: 11 mpg

Highway: 15 mpg

Combined: 12 mpg

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26 of 32 Roadshow

Ferrari F12 Berlinetta: 12 mpg

Ferrari's V-12 grand tourer has about 360 miles of touring range between fill ups if you take it nice and easy on the highway. Buuuut, with 730 hp and a top speed of 211 mph, you probably won't be taking it easy at all.

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27 of 32 Mercedes-Benz

Mercedes-Benz G65 AMG: 12 mpg

US EPA mpg estimates:

City: 11 mpg

Highway: 13 mpg

Combined: 12 mpg

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28 of 32 Mercedes-Benz

Mercedes-Benz G65 AMG: 12 mpg

Take one of Mercedes-Benz' most ridiculous vehicles and add one of its most ridiculous engines and you've got the G65. This excessively overbuilt SUV boasts a 630 horsepower, bi-turbo V-12 engine. Yes, it's ridiculous, but it's also so very awesome.

Lamborghini Aventador: 12 mpg
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29 of 32 Antuan Goodwin/Roadshow

Lamborghini Aventador: 12 mpg

US EPA mpg estimates:

City: 10 mpg

Highway: 17 mpg

Combined: 12 mpg

Lamborghini Aventador: 12 mpg
5:02
30 of 32 Antuan Goodwin/Roadshow

Lamborghini Aventador: 12 mpg

This low-slung beast looks like it should slice through the air with its razor-sharp aerodynamics, but this 690-hp machine is built for speed, not efficiency. Zero to 60 mph happens in under 3 seconds with a top speed rumored to exceed Lambo's stated max of 217 mph.

Bugatti Veyron: 10 mpg
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31 of 32 Josh Miller/Roadshow

Bugatti Veyron: 10 mpg

US EPA mpg estimates:

City: 8 mpg

Highway: 15 mpg

Combined: 10 mpg

Bugatti Veyron: 10 mpg
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32 of 32 Josh Miller/Roadshow

Bugatti Veyron: 10 mpg

For many years, the Veyron held the title of fastest car in the world, so it's no surprise that this 16-cylinder, quad-turbo cruise missile is the least efficient production car in America. I'd be willing to deal with 8 mpg in the city to get a top track speed in excess of 250 mph. Fortunately for the environment, the $2 million-plus price tag puts it just outside of my budget.

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