28 MPG combined. That’s the figure for the 2021 Volkswagen Jetta GLI’s fuel economy, a good balance for drivers who want both performance and practicality. The GLI adds some sport to the traditionally sensible Jetta. For enthusiasts who need a daily driver, the GLI’s fuel consumption is an acceptable tradeoff for its punchy turbocharged engine and engaging driving dynamics.

City and highway performance

The EPA estimates for the 2021 Jetta GLI break down to 24 MPG in the city and 35 MPG on the highway. The city figure reflects stop-and-go driving, where the GLI’s responsive throttle can encourage quick acceleration. The automatic transmission, with its relatively tall gearing, helps provide decent efficiency once you’re up to speed. On the open road, the 35 MPG rating shows the benefits of the GLI’s aerodynamic shape and the engine’s ability to cruise comfortably at highway speeds without working too hard. Drivers who frequently take longer trips will find the highway fuel economy appealing, extending the range between fill-ups.

Annual fuel cost

According to the EPA, the estimated annual fuel cost for the 2021 Volkswagen Jetta GLI is $1,550. This calculation is based on driving 15,000 miles per year, with a fuel price that reflects the national average. Fuel price changes will affect the real-world cost, but this figure is a useful benchmark for comparing the GLI’s operating expenses to other vehicles. People covering fewer miles annually can expect to spend less on fuel, while those with longer commutes will likely exceed this estimate.

Real-world expectations

The EPA estimates provide a comparison, but real-world fuel economy can vary depending on driving habits and conditions. Drivers who are heavy-footed, who often use the GLI’s sport mode, or explore the engine’s full rev range, will likely see fuel economy figures below the EPA estimates. However, those who focus on smooth acceleration, anticipate traffic flow, and use cruise control on the highway can often achieve MPG numbers closer to, or even exceeding, the official ratings. The GLI’s eagerness can easily tempt drivers into more spirited driving, so careful driving is key to maximizing fuel efficiency.

How it compares

The Honda Civic Si, another choice in the sport compact segment, achieves an EPA-estimated 31 MPG combined, a slight edge over the GLI in fuel economy. The Hyundai Elantra N Line, with its focus on performance, matches the GLI’s 28 MPG combined rating. This puts the GLI in the mix with its competitors, a compromise for the power and driving experience it delivers. Someone considering JETTA MPG across all years will find the GLI trades some efficiency for a more potent engine and enhanced driving dynamics compared to the standard Jetta.

Tips to maximize efficiency

Avoid aggressive acceleration and braking. The GLI’s turbocharged engine is responsive, but quick inputs will diminish fuel economy. Focus on smooth acceleration to bring the car up to speed efficiently. Anticipate traffic flow and brake gradually to minimize energy loss.

Maintain proper tire inflation. Underinflated tires increase rolling resistance, forcing the engine to work harder and consume more fuel. Check your tire pressure regularly and inflate them to the recommended level, which can be found on the driver’s side doorjamb or in the owner’s manual.

Reduce unnecessary weight. Extra cargo in the trunk or on the roof rack adds weight, which hurts fuel economy. Remove items that are not essential to help the GLI achieve its best possible MPG. This is especially important for drivers who frequently carry passengers or cargo.

Optimize your highway driving. Use cruise control on long highway stretches to maintain a consistent speed and minimize throttle changes. Avoiding unnecessary lane changes and maintaining a safe following distance can contribute to better fuel economy. For drivers looking at all Volkswagen fuel economy data, highway driving is where the GLI can perform well with its aerodynamic efficiency.