How Many MPG Does a Hummer H3 Have

The Hummer H3, a popular sport utility vehicle manufactured from 1985 to 2008, was known for it’s ruggedness and off-road capabilities. However, one question that often arises is it’s fuel efficiency. Many car enthusiasts and potential buyers are curious about how many miles per gallon (MPG) the Hummer H3 can achieve. According to the Environmental Protection Agency (EPA), the Hummer H3's fuel economy varied depending on the model year and drivetrain. For example, the 2006 Hummer H3, featuring a 3.5 L, 5-cylinder engine and manual 5-speed transmission, had an average fuel economy of 16 MPG in the city and 18 MPG on the highway. This resulted in a combined MPG of 14. However, it's important to note that individual driving habits and conditions can impact fuel efficiency.

How Reliable Are H3 Hummers?

When it comes to reliability, the H3 Hummer has gained a reputation for being one of the most dependable vehicles in it’s class. The last version of the H3, before it was discontinued, was considered one of the best in terms of reliability. This is largely due to it’s solid build quality and rugged design, which were engineered to withstand tough terrains and harsh driving conditions.

With it’s advanced four-wheel drive system, this vehicle is known for it’s exceptional off-road performance and durability. Whether it’s navigating through muddy trails or climbing steep hills, the H3 Hummer can handle it all with ease, thanks to it’s robust V8 engine.

Speaking of the engine, the H3 Hummer comes equipped with a powerful V8 engine that delivers impressive performance. This engine is known for it’s strength and reliability, giving drivers the confidence to take on any adventure with peace of mind. However, it’s important to note that the H3 Hummers fuel economy isnt it’s strong suit. Like most Hummer models, it consumes more fuel than your average vehicle, but thats to be expected given it’s size and capabilities.

It’s reputation for reliability, combined with it’s impressive performance and solid build quality, make it a popular choice among adventurers and outdoor enthusiasts.

When it comes to fuel efficiency, Hummer H2s fall short with an average of 11 to 12 miles per gallon. With 13 MPGs on the highway and 10 MPGs in the city, these vehicles aren’t suitable for those seeking gas efficiency. While they excel in off-road performance and style, there’s definitely a trade-off when it comes to fuel costs.

Is a Hummer Good on Gas?

When it comes to fuel efficiency, the Hummer H2 falls quite short. With average gas mileage ranging from 11 to 12 miles per gallon, this vehicle isn’t a suitable choice for those seeking a gas-efficient option. To be more specific, you can expect around 13 miles per gallon on the highway and 10 miles per gallon in city driving conditions. These numbers may vary slightly depending on various factors such as driving habits and road conditions, but the overall fuel efficiency remains notably low.

This vehicle is intended for off-road adventures and making a bold style statement on the road. It’s hefty size and powerful engine contribute to a thrilling and commanding driving experience, but this comes at the cost of fuel consumption. The H2 was primarily developed to provide exceptional off-road capabilities, reinforced by it’s robust body and elevated ground clearance.

Considering the fuel budget, owning a Hummer H2 may require a significant allocation of resources. Regular trips to the gas station will be inevitable, and frequent refueling may put a strain on your wallet. Therefore, if fuel efficiency is high on your list of priorities, there are certainly more suitable options available. However, if you’re captivated by the allure of the Hummer H2s bold design and impressive off-road capabilities, the compromise on gas mileage may be worth it for you.

It’s worth mentioning that advancements are being made in the automotive industry to enhance fuel efficiency, including hybrid and electric options to reduce environmental impact and fuel consumption. As such, it’s important to evaluate your individual needs and priorities before making a decision.

Comparison of the Hummer H2’s Gas Mileage to Other SUVs

When comparing the gas mileage of the Hummer H2 to other SUVs, it’s important to note that the Hummer H2 is known for it’s relatively low fuel efficiency. While more fuel-efficient SUVs on the market may achieve higher miles per gallon, the Hummer H2 tends to consume more fuel due to it’s larger size and heavier weight. Therefore, if fuel economy is a priority, there are other SUV options available that offer better gas mileage than the Hummer H2.

Now let’s delve into the factors that contribute to the cost of maintaining and repairing a Hummer H3.

Are Hummer H3 Expensive to Fix?

When it comes to the maintenance and repair costs of a Hummer H3, owners may need to be prepared for a range of expenses. However, it’s important to note that this average cost can fluctuate depending on the specific repairs needed and the region in which the vehicle is serviced.

Larger repairs or replacements, such as the transmission, engine, or suspension components, can account for a significant portion of the costs. These repairs generally tend to be on the higher end of the scale, potentially ranging from $1,000 to $2,000 or more.

Additionally, the cost of parts can influence repair expenses. Genuine Hummer parts can be more expensive compared to aftermarket alternatives. It’s worth consulting with a trusted mechanic or doing some research to weigh the pros and cons of different options and their impact on your wallet.

Source: Hummer H3 Repair & Maintenance Estimates – YourMechanic

Additionally, many drivers also experienced issues with the H3’s transmission, with complaints ranging from harsh shifting and slipping gears to complete transmission failure. Other common problems included electrical system malfunctions, faulty suspension components, and poor fuel efficiency. Overall, the 2006 Hummer H3 faced numerous mechanical and reliability issues that left owners frustrated and seeking costly repairs.

What Are the Main Problems With Hummer H3?

However, these problems weren’t limited to the engine alone. Many owners also experienced issues with the transmission. The transmission in the Hummer H3 was known to have a lack of smoothness during shifting, and in some cases, it would even fail completely, leaving drivers stranded on the side of the road.

Another common complaint among Hummer H3 owners was the poor fuel efficiency. With it’s large size and heavy weight, the H3 was notorious for guzzling gas at an alarming rate. This not only put a dent in the owners wallet but also contributed to environmental concerns.

Furthermore, the H3 was known for it’s limited visibility. The thick pillars and small windows made it difficult for drivers to see their surroundings, especially when maneuvering in tight spaces or changing lanes on the highway. This posed a safety risk and required extra caution from the driver.

Lastly, the Hummer H3 had a relatively cramped interior. Despite it’s large exterior dimensions, the H3s cabin space was not utilized efficiently. Rear-seat passengers often complained about a lack of legroom and uncomfortable seating, while the cargo capacity was also limited compared to other vehicles in it’s class.

Overall, the 2006 Hummer H3 faced numerous problems, including engine and transmission issues, poor fuel efficiency, subpar build quality, limited visibility, and a cramped interior.

Build Quality Issues: In Addition to the Engine and Transmission Problems Mentioned, the Hummer H3 Was Also Known for It’s Subpar Build Quality. This Resulted in Various Issues Such as Rattling Noises, Loose Interior Trim Pieces, and Overall Poor Fit and Finish.

The Hummer H3 had some concerns beyond just engine and transmission problems. One major issue was it’s inferior build quality. This led to problems like rattling sounds, loosely fitted interior trim pieces, and an overall inadequate fit and finish.

Moving on to subsequent years, the 2007 Hummer H3 saw some improvements in terms of reliability and performance. Although it still had it’s share of minor issues, they weren’t as prevalent as those in the 2006 model. However, if you’re in the market for a more reliable and trouble-free experience, it’s advisable to steer clear from the 2006 version and explore other options.

What Years to Avoid on Hummer H3?

The next model year to tread with caution is the 2007 Hummer HWhile it improved in some areas compared to it’s predecessor, this particular year still had it’s fair share of troubles. One notable issue was a recurring problem with the fuel system, resulting in frequent fuel leaks and potential fire hazards. Additionally, electrical malfunctions were a common occurrence, causing various components such as the radio, windows, and even the engine to malfunction unexpectedly.

One of the most recurring complaints was related to the air conditioning system, which frequently failed to provide adequate cooling, especially in hot climates. Additionally, many owners reported issues with the electrical system, such as faulty wiring and intermittent power failures.

Lastly, the 2010 Hummer H3 also suffered from suspension problems, with noticeable sagging and a bumpy ride being commonly reported. This issue not only compromised driving comfort but also hinted at potential safety risks, particularly during off-road adventures or uneven terrains. Overall, it’s important to carefully evaluate these model years and consider alternative options or seek well-maintained, inspected vehicles to avoid potential headaches and costly repairs.


The EPA fuel economy for this vehicle ranged from 14 to 18 MPG in the city and 16 to 18 MPG on the highway. The overall combined fuel efficiency averaged at around 16 MPG. It’s worth noting that these figures are for the 2006 Hummer H3 model with a 3.5L, 5-cylinder engine and a manual 5-speed transmission running on regular gasoline. While the H3 was known for it’s robust and powerful performance, it’s fuel efficiency was not it’s strong suit. However, it’s essential to consider other factors such as the vehicle's purpose and the individual driver's habits when assessing it’s overall suitability.

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