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Gmc

Most of us would like to think that America's taste in cars has moved past the gas-guzzling monster trucks and SUVs of yore. While it is true that the country's collective self-conscience has shifted to greener pastures, the truth is that there are still plenty of deplorably inefficient vehicles on the road. In fact, the vehicles with the worst fuel efficiency for 2010 barely hit double digits.

Technically, the least fuel-efficient vehicles for 2010 are made by the likes of Ferrari and Lamborghini (the Lambo Murcielago takes the cake with 8 mpg city and 13 mpg highway). However, for this list Autotropolis has decided to stick to large-scale production vehicles. With that in mind, here are the 2010 vehicles with the worst gas mileage:

2010 Jeep Grand Cherokee (SRT8)
(14 mpg combined)

Outfit your 2010 Jeep Grand Cherokee with all-wheel drive and the SRT8 performance package, and you'll cruise along at 12 mpg in the city and 16 mpg on the highway. As with most vehicles on this list, the 2010 Grand Cherokee SRT8 compromises fuel efficiency for power and performance. This decadent SUV teems with a 6.1-liter Hemi V8 engine that outputs 420 horsepower and 420 lb-ft. of torque.

Despite the Jeep's large size, the vehicle screams from 0-to-60 mph in less than five seconds. Base price for the 2010 SRT8 Grand Cherokee is $43,325.

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2010 Nissan Titan
(14 mpg combined)

Trucks are notorious for their poor fuel performance. The worst offender this year is the 2010 Nissan Titan. Outfitted with all-drive, the Titan guzzles 12 mpg in the city and 17 mpg on the highway. Fill 'er up with E85 flex fuel, and the EPA estimates 9 mpg in the city and 12 mpg on the highway (10 mpg combined). All that gas goes towards powering a 5.6-liter V8 that musters 317 horsepower and 385 lb-ft. of torque. Unless you need the superior hauling and towing power of the 2010 Titan, steer clear of this completely un-green machine.

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2010 HUMMER H3
(14 mpg combined)

The most infamously inefficient vehicle brand once again graces the list of least fuel-efficient vehicles. HUMMER's 2010 H3 and H3T earn as little as 13 mpg in the city and 16 mpg on the highway. Flex-fuel E85 brings those numbers down to 9 mpg city and 12 mpg highway. To achieve those paltry numbers, you'll need to upgrade to the 5.3-liter V-8 engine, which offers 300 horsepower and 320 lb-ft. of torque. While the 2010 HUMMER H3 excels in off-road situations, the price of gasoline these days is enough to make even the biggest off-roader think twice about sitting behind the driver's seat of one of these behemoths.

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Mercedes-Benz CL-Class (CL63)
(14 mpg combined)

The Mercedes-Benz CL63 AMG is a car built around the idea of excess. When it comes to superior luxury and performance, this is a good thing. However, all that excess fuel consumption means 11 mpg in the city and 18 mpg on the highway. Of course, this may be unimportant to you if you're looking for a 6.3-liter V-8 that tops out at 518 horsepower and 465 lb-ft. of torque. And, if you're willing to drop a cool $145,200 to own the 2010 CL63 AMG, then you probably won't care too much about your monthly expenditures on gasoline.

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2010 GMC Savana/Chevrolet Express
(14 mpg combined)

If you're in the market for a cargo van, then storage capacity or passenger space is likely the most important factor in your buying decision. To acquire all that extra space, you'll have to sacrifice fuel economy. The 2010 GMC Savana and 2010 Chevrolet Express are GM clones that offer as little as 13 mpg in the city and 17 mpg on the highway (when equipped with a 5.3-liter V-8). With E85, those figures drop to 10 mpg city and 13 mpg highway. Of course, competitors like the Ford Econoline Series don't do much better. As such, if you need a full-size van, you're just going to have to get used to the idea of betraying Mother Nature.

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2010 Porsche Cayenne
(13 mpg combined)

Porsche has always been known for one thing – performance. And when you pile that legendary performance into a big, opulent SUV, the result is a vehicle that offers as few as 11 mpg in the city and 17 mpg on the highway (GTS models with a manual transmission). The 2010 Porsche Cayenne GTS comes equipped with a 4.8-liter 385-hp V-8 engine. Add in a price tag of more than $70,000, and it's clear that the Cayenne GTS is reserved solely for those who want sports car performance in an SUV package.

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2010 Mercedes-Benz M-Class (ML63)
(12 mpg combined)

Mercedes-Benz has two vehicles that tie for the worst fuel efficiency for 2010. The 2010 Mercedes-Benz ML63 AMG is a performance-tuned luxury SUV that competes directly with the Porsche Cayenne. Fuel efficiency is estimated at 11 mpg in the city and 15 mpg on the highway. The 6.3-liter V-8 engine boasts 503-horsepower and 465 lb-ft. of torque. Base price comes in at about $90,000.

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2010 Mercedes-Benz G-Class (G55)
(12 mpg combined)

The Mercedes-Benz G55 SUV off-road performer performs just as poorly as the ML63 when it comes to fuel efficiency. A 5.5-liter V-8 engine hums along at 500 horsepower and 516 lb-ft. of torque. All-wheel drive and a 0-to-60 mph time of 5.4 seconds only serve to further deplete the vehicle's fuel efficiency. If you want a high-end luxury vehicle that you can take off the beaten path, then perhaps the 2010 Mercedes-Benz G55 is for you. Otherwise, keep your eyes on the road with a more fuel-efficient option.

An Internet router is now available as a dealer-installed option through General Motors on select new vehicles, including Cadillac, Chevrolet, GMC and Buick brands. For now, the router is a dealer-installed option available only in General Motor’s vehicles most likely to be used by families -- SUVs, vans, trucks and crossovers.

The router is made by Autonet Mobile of San Francisco and comes with a docking station so that it can be easily moved from one vehicle to another. The routers and accessories are also supplied to Chrysler and Volkswagen through Autonet Mobile.

The Internet router creates a Wi-Fi hotspot in and around the vehicle, for up to 150 feet, so that passengers can use laptops, smart phones and other portable devices to connect to the internet while on the road. This Internet connection also allows the driver to listen to streaming Internet radio stations. Small businesses can also stay connected through the use of the mobile Internet router.

Sterling Pratz, the CEO of Autonet Mobile gave a statement saying that, “Ninety percent of customers prefer surfing the Internet over just watching movies. Customers want the biggest brands the Internet has to offer in their car, such as FaceBook, YouTube and FlyCast Internet radio.”

With the Autonet Internet router in your GM vehicle you can check email, listen to Internet radio or surf the web. Book a hotel or find the best place to eat in a new city while on your next business trip or family vacation. There is no waiting to find a Wi-Fi hotspot at a café or fast food restaurant. The router is capable of connecting 10 or more people using multiple devices and works with any Wi-Fi device, including gaming systems.

There is a monthly charge for use of the Internet service along with a service agreement and contract, but there are no overages, roaming charges or surcharges associated with the service. The Autonet Internet router is being installed on certain GM model vehicles now and could be installed in other vehicles at a later time. The Internet router and docking station are also available for purchase from specific GM accessories shops.