24 MPG combined isn’t going to win any hypermiling contests, but for the 2018 Porsche 911 Carrera 4 Cabriolet, it’s an acceptable trade-off. This isn’t a car bought by people focused solely on saving at the pump. This 911 is about open-air thrills, all-weather confidence from its all-wheel drive system, and timeless Porsche engineering, a compromise many owners happily make for the experience offered.

City and highway performance

The EPA estimates 21 MPG in the city and 28 MPG on the highway. These figures represent everyday driving and provide a way to compare vehicles. The Carrera 4 Cabriolet has a 3.0L turbocharged six-cylinder engine that balances performance with some efficiency. The 7-speed automatic transmission (AM-S7) selects gears for both quick acceleration and efficient cruising, contributing to the highway MPG. Expect a significant difference between city and highway fuel consumption, whether you’re navigating urban traffic or enjoying a weekend road trip, because the engine works harder to accelerate in the city.

Annual fuel cost

The EPA estimates an annual fuel cost of $2,400 for the 2018 Porsche 911 Carrera 4 Cabriolet. This calculation is based on driving 15,000 miles per year and using the national average fuel prices at the time of the estimate. Actual fuel costs will change depending on gas prices in your area and your driving habits. Drivers who often drive aggressively and spend more time at higher RPMs will likely exceed this estimate, while those who mostly cruise on the highway might see a lower annual cost.

Real-world expectations

The EPA provides a standardized test, but your real-world MPG will vary. Aggressive acceleration, frequent short trips where the engine doesn’t reach optimal operating temperature, and prolonged idling can all hurt fuel economy. Smooth, consistent driving at moderate speeds, proper tire inflation, and regular maintenance can help you get figures closer to the EPA estimates. The appeal of the 911 often leads to enthusiastic driving, so consider that in your personal fuel consumption calculations. The engine wants to be revved, and resisting that is difficult. Owners can check 911 MPG across all years for more data.

How it compares

The 2018 Porsche 911 Carrera 4 Cabriolet is in the middle of the pack compared to other high-performance convertibles. A BMW M4 Convertible, for example, achieves around 19 MPG combined. An Audi S5 Cabriolet can manage closer to 24 MPG combined, similar to the 911. A Chevrolet Corvette Stingray Convertible, despite its larger engine, can get highway figures around 27 MPG, thanks to its efficient engineering. The slightly better numbers posted by some other models don’t necessarily mean those marques are better, especially considering the unique driving experience and brand cachet the 911 delivers. Drivers considering this Porsche should also review all Porsche fuel economy data.

Tips to maximize efficiency

Use the Porsche’s driving modes to save fuel. Select “Normal” or “Eco” mode for everyday driving. These modes soften throttle response and encourage earlier upshifts, using less gas without sacrificing too much performance.

Make sure your tires are properly inflated. Check the sticker on the driver’s side doorjamb for the recommended tire pressure. Tires with the right pressure reduce rolling resistance, improving fuel economy and extending tire life.

Anticipate traffic and avoid hard acceleration and braking. Consistent speed minimizes fuel consumption. Look ahead to avoid stop-and-go driving where possible.

Only carry essential items in the car. Extra weight uses more gas, so remove unnecessary items from the trunk and passenger areas. Every pound adds up.

Think about the fuel you’re using. The Carrera 4 Cabriolet performs best on premium fuel, but confirm the minimum octane requirement in your owner’s manual to avoid unnecessary expense. Using lower octane fuel than recommended can hurt performance and potentially damage the engine.