The best used SUV (Sport Utility Vehicle) to buy depends on the needs of you and your family. SUVs have become one of the most popular, sought after vehicles today. This is because of the spacious interior, flashy technology for entertainment as well as the large amounts of cargo the vehicle can carry.SUVs come in lots of shapes and sizes and deciding which is best for you depends on how you will be using the vehicle. There are compact SUVs, mid-sized SUVs and large-sized SUVs.Compact sport utility vehicles sometimes referred to as crossover SUVs, offer better gas mileage than its larger brothers or sisters. Because of the size, you can expect between 23-25 mpg in the city and 28-31 mpg across the highway.You will find that if you are looking for fuel efficiency as your top priority, the compact SUV will fit the bill the best.In exchange for better gas mileage, you will have to trade in a little bit of passenger room and cargo space. Most compacts will carry 5 passengers comfortably with a smaller hatch-back styling to lug around the equipment you need to tote.So, with compact, consider the size of your family as well as the gear you need to carry around to your family’s activities. If you have two small kids as well as their strollers and toys, a compact SUV may suit you just fine.A couple of good examples of compact SUVs are the Ford Escape and the Honda CRV.If you decide that this simply isn’t large enough for your family or your cargo, you may want to choose a used mid-sized SUV.A mid-sized sport utility vehicle will still get you decent gas mileage averaging 16-17 mpg in the city to 23-24 mpg over the roadways. This slightly lower fuel economy offers more comfortable seating capacity.Most often mid-sized SUVs will comfortably seat 6-8 passengers depending on the make and model you choose. Some of these will more easily seat 8 smaller passengers and 6 adult-sized passengers. It is best to do your homework on the different make and models before you make your choice here.Where the seating may be more appealing, some mid-sized SUVs offer a more car-like driving feel and therefore don’t have the cargo capacity.So do your research to find the perfect fit for you.If you and your family spend the weekends camping, boating, or jet-skiing; you will also want to check into the towing capacity of the sport utility vehicle that you choose. Mid-sized will offer more towing capabilities where most compact SUVs do not.If you do find yourself in need of stronger towing capacity, most likely you will want to check into the larger used SUVs.The large-sized sport utility vehicles offer towing up to 8,000 to 9,000 pounds. This is comparable to some pickup trucks.In trade for the towing, you will lose some of the fuel economy with large-sized SUVs. It is average to get 14 mpg for city driving and only about 18 mpg running down the highway.Of-course, these babies have much more seating ability with most of them comfortably carrying 8 adults for a long ride. In addition the cargo space with which you can carry your stuff is much larger also.Now you are able to see that the best used SUV to buy truly depends on the purpose you will be using the vehicle for. It is best to look up online some of the best models to choose for the size that will suit your needs.