26 MPG combined is an acceptable fuel economy figure for the 2021 Audi A5 Cabriolet quattro 2.0L 4-cyl, a car that prioritizes open-air thrills and all-weather confidence over pure efficiency. Someone buying this A5 isn’t solely focused on saving money at the pump. They’re seeking a stylish, luxurious convertible with a potent engine and the surefootedness of all-wheel drive. They want to enjoy top-down cruising on a sunny day, and they’re willing to trade a few MPGs for the driving experience and prestige that come with the Audi badge. Fuel economy is a consideration, but functionality and fun are higher on the list.

City and highway performance

The EPA estimates 23 MPG in the city and 31 MPG on the highway for the 2021 Audi A5 Cabriolet quattro with the 2.0L engine. The city figure reflects the realities of stop-and-go traffic, where the engine spends more time idling and accelerating. The highway estimate shows the A5’s efficiency, aided by its well-tuned automatic transmission and relatively aerodynamic shape. The 7-speed S tronic dual-clutch automatic selects gears smoothly and efficiently, keeping the engine in its optimal power band for either spirited acceleration or relaxed cruising, which contributes to a good highway MPG number.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2021 Audi A5 Cabriolet quattro 2.0L 4-cyl at $2,250. This figure is based on driving 15,000 miles per year and assumes national average fuel prices. Fuel prices fluctuate, and your actual fuel costs may vary, depending on how much you drive, where you drive, and your driving style. The $2,250 figure provides a useful benchmark for comparing the A5 Cabriolet’s running costs to other vehicles in its class.

Real-world expectations

While the EPA estimates provide a standardized measure of fuel economy, real-world results can vary considerably. Factors such as driving style, traffic conditions, and even tire pressure can impact your actual MPG. Aggressive acceleration, frequent hard braking, and prolonged idling will all lower your fuel economy. Conversely, smooth, consistent driving and proper vehicle maintenance can help you get closer to the EPA estimates. The quattro all-wheel-drive system, while beneficial for traction and handling, does add weight and complexity and may reduce fuel economy compared to a front-wheel-drive convertible.

How it compares

The A5 Cabriolet occupies a niche market, but it still faces competition from other luxury convertibles. The BMW 430i Convertible, for example, achieves an EPA-estimated 28 MPG combined with its rear-wheel-drive configuration and 2.0L engine. That’s a notable advantage, but you lose the security of all-wheel drive. The Lexus LC 500 Convertible, with its powerful V8 engine, delivers a much lower 18 MPG combined, but its target buyer prioritizes performance and sound over less gas. The Mercedes-Benz C300 Cabriolet achieves around 25 MPG combined, similar to the A5, but it might not offer the sporty handling that Audi drivers appreciate. Examining A5 MPG across all years can also provide perspective on how this model’s efficiency has evolved. Checking all Audi fuel economy data can also help buyers understand the brand’s overall approach to fuel economy.

Tips to maximize efficiency

Maintain consistent speeds on the highway. Using cruise control allows the A5 to maintain a constant speed and minimize unnecessary acceleration and deceleration, the two situations where fuel is most often wasted. Avoiding excessive lane changes and maintaining a safe following distance will also contribute to more efficient driving.

Pay attention to tire pressure. Underinflated tires create more rolling resistance, which reduces fuel economy. Check your tire pressure regularly and inflate your tires to the recommended pressure specified on the sticker inside the driver’s side door. A few PSI difference can impact the overall MPG figure.

Minimize idling. Idling consumes fuel without covering any distance. If you anticipate being stopped for more than a minute, turn off the engine. The A5 features an automatic start/stop system that automatically shuts off the engine at stoplights and restarts it when you release the brake pedal. Make sure this system is active to maximize fuel savings in city driving.

Lighten the load. Carrying unnecessary weight in your vehicle reduces fuel economy. Remove any items from your trunk or backseat that you don’t need. Added weight affects MPG, especially during acceleration. The A5 is designed to be sporty, and carrying extra weight reduces this sporty feeling and affects MPG.

Use the appropriate driving mode. The A5 has selectable driving modes that allow you to tailor the vehicle’s performance to your driving style and conditions. Select “Efficiency” or “Comfort” mode for everyday driving to optimize fuel economy. Avoid using “Dynamic” mode unless you’re seeking maximum performance, as it prioritizes power over efficiency.