As families get bigger and road trips get longer, fuel-efficient diesel SUVs like the GMC Terrain and Audi Q7 are becoming more popular. But just because an SUV has a diesel option doesn’t mean it’s a good deal.

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, has rounded up the 10 best used diesel SUVs you can buy.

Let’s face it, SUVs aren’t the cheapest vehicles—but choosing a diesel SUV can help you save money in the long run. Not only does diesel get more miles to the gallon but technological advancements make straight diesel a cleaner, greener option than gas. Read on to see what models and years offer the best option for your new-to-you diesel SUV.

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2008, 2009, 2014, 2017 Audi Q7

Price: $7,000-$35,000

The

Audi Q7

has earned some outstanding consumer ratings for its older models’ above-average gas mileage (19 mpg in the city and 28 mpg on the highway) and reliability. Overall quality and an impressive list of standard options even on base models make this a great option for a used SUV.

Pros: Great for families

Cons: Fuel economy not as high as other used SUVs

Key Takeaway One of the key reasons people are buying diesel SUVs is the fuel economy, so if that’s your goal, the Q7 may not be the best option for you.

2010-2016 GMC Terrain

Price: $6,500-$16,000

Fuel economy is a huge selling point for the

GMC Terrain

, which averages a consistent 32 miles per gallon. Each of the model years suggested here earned Top Safety Pick awards from IIHS, and the 2014 model year earned the Top Safety Pick+ rating, making this an excellent pick for families.

Pros: Top-rated for safety

Cons: Cloth seats can be difficult to keep clean

MORE: 7 things to look for when buying a used car

2010-2012 Mercedes-Benz GL350 Bluetec 4MATIC

Price: $9,000-$15,000

Unlike most diesel vehicles, the

GL350 Bluetec

is surprisingly smooth and quiet from the cabin. While it doesn’t deliver the fuel efficiency of most diesels and diesel hybrids (the Bluetec diesel yields only about an extra 4 mpg city and 5 mpg highway), the savings are significant enough over time to make the comfortable ride make sense.

Pros: Impressively smooth and quiet ride

Cons: Poor gas mileage

2010-2011 Mercedes-Benz R350 Bluetec

Price: $6,500-$11,000

A bit more minivan than SUV, the R350 Bluetec offers a combination of seating capacity and fuel economy that makes it a great pick for families. The R350’s 268-horsepower, 3.0-liter V6 engine’s mpg rating is 18 city and 24 highway, placing it solidly in the middle of the pack for fuel economy.

Pros: Lots of room for families

Cons: Discontinued model may be hard to find parts for if repairs are needed

Key Takeaway The R350 Bluetec is a great option for drivers with large families to haul.

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How to check if a used car is a lemon

2011 Audi Q7 TDI

Price: $10,000-$12,500

An SUV that’s as reliable as it is fun to drive, the

Audi Q7 TDI

’s 225-horsepower, turbo-diesel V6 drives as smoothly and as quietly as a gasoline engine. The fuel tank’s average 550-mile range makes it an excellent choice for everything from everyday errands to cross-country road trips.

Pros: Plenty of space and fuel economy make it great for long rides

Cons: Some owners have reported electrical issues with the infotainment system

2011 BMW X5 xDrive 35d

Price: $8,000-$10,500

Handling and performance make the

BMW X5 xDrive 35d

a standout in its field. While many diesel SUVs can feel cumbersome and laggy, that’s not the case with the X5. Combined with the spacious and luxurious interior, this vehicle’s average 22 mpg fuel economy makes it a great pick for a used diesel SUV.

Pros: All-wheel drive is standard

Cons: Optional seven-passenger seating was a pricey add-on

2011 Volkswagen Touareg TDI

Price: $9,500-$11,500

Reasonably priced and reliable, the

VW Touareg TDI

received some rear seat upgrades in 2011 that make this model particularly desirable for families. The 225-horsepower, 3.0-liter turbodiesel V6 returns about 28 mpg on the highway, which is notable for an SUV.

Pros: Luxurious interior and all-wheel drive comes standard

Cons: Diesel mpg advantage only notable in highway mileage

2013 Porsche Cayenne Diesel

Price: $20,000-$23,000

The

Porsche Cayenne Diesel

may not be the best diesel SUV, but with the added reliability and clout of the Porsche name, for some, that’s enough. Powered by a 240-horsepower, 3.0-liter V6 diesel engine, the Cayenne returns about 19 mpg in the city and 29 mpg on the highway for an average fuel economy of about 23 mpg.

Pros: Quality and handling

Cons: Pricey, as you’d expect from a Porsche

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2016 Jeep Grand Cherokee EcoDiesel

Price: $24,000-$28,000

EcoDiesel is a comparatively recent addition to the Jeep lineup, but it’s an extremely efficient one, and the 2016 model year added a number of technological perks not available on previous models. The Grand Cherokee’s 3.0-liter V6 returns 22 mpg in the city and a whopping 30 mpg on the highway, making it one of the most fuel-efficient Jeeps available.

Pros: Unbelievable gas mileage for a Jeep

Cons: Comparatively pricey next to other diesel SUVs

2016-2019 Hyundai Tucson

Price: $16,500-$22,500

On the smaller side for SUVs, the

Hyundai Tucson

was redesigned in 2016 to add a bit more heft and safety to its frame. Bigger size didn’t mean sacrificing gas mileage, though, as the next three model years continued to offer up 33 mpg highway.

Pros: Top Safety Pick+ rating for 2016, 2017, and 2019

Cons: Small for an SUV

Key Takeaway The Hyundai Tucson is a great pick for safety, but it leaves a little to be desired for size.

MORE:

How to buy a car from a private seller

How to find affordable insurance for your diesel SUV

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FAQs

Is diesel better than gas?

It depends. Most buyers looking for diesel engines are interested in fuel economy, but diesel can also be a “cleaner, greener” option in some cases. Diesel is a more expensive fuel; however, drivers get more proverbial bang for their buck since overall mpg is higher, especially at highway speeds.

Is diesel more expensive than gas?

Yes and no. You’ll likely pay more up front, but you could save in the long run. Generally, diesel powertrains cost more and diesel fuel costs more per gallon than gasoline. However, over time, drivers usually end up saving money with diesel since the engines are generally more reliable and they tend to return higher mpg, meaning you’ll purchase less fuel.

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