18 MPG combined. That’s the reality for drivers of the 2015 Ford Mustang Convertible with the 5.0L V8. Buyers drawn to this particular Mustang aren’t prioritizing fuel efficiency. They crave the thrill of a naturally aspirated V8, the iconic look, and the wind-in-your-hair experience. They’re buying a feeling, a statement, and that comes at a pump-related price. These are enthusiasts more concerned with horsepower than saving gas, often willing to trade economy for the sound and sensation only a Mustang GT convertible can deliver.

City and highway performance

The EPA estimates peg city driving at 15 MPG and highway cruising at 23 MPG. These numbers offer a reasonable baseline, but driving style will significantly impact the results. The city MPG reflects the inefficiency of stop-and-go traffic, especially with a large-displacement engine that requires more fuel to get the sizable Mustang moving from a standstill. The highway figure is better, but aggressive acceleration and high speeds will quickly lower that number. This Mustang invites you to use its performance. If you resist that urge constantly, you’ll get closer to 23 MPG. But who buys a V8 Mustang convertible to resist that urge?

Annual fuel cost

The EPA estimates an annual fuel cost of $2,450 for the 2015 Ford Mustang Convertible 5.0L. This figure is based on driving 15,000 miles per year, with 45% of those miles driven in the city and 55% on the highway. The calculation also assumes national average fuel prices. Your individual fuel costs will vary depending on how much you drive, where you drive, and the fluctuating price of gasoline. But $2,450 provides a clear benchmark for prospective owners.

Real-world expectations

While the EPA provides standardized testing, real-world fuel economy often differs. Mustang GT convertible owners frequently report numbers within a reasonable range of the official figures, but slightly lower. Expect combined MPG in the 16-19 MPG range depending on driving habits. Frequent bursts of acceleration, enthusiastic cornering, and extended idling will push that number down. Gentle acceleration, anticipation of traffic flow, and consistent highway speeds yield the best results. The Mustang’s engine rewards a heavy foot with immediate power, but that enjoyment comes at a fuel cost.

How it compares

Compared to other performance convertibles, the 2015 Mustang 5.0L occupies a specific niche. A BMW 435i Convertible (rated at 20 MPG combined) offers a more refined driving experience, but lacks the raw power and appeal of the Mustang’s V8. A Chevrolet Camaro Convertible with the 6.2L V8 (rated at 19 MPG combined) is a closer competitor, offering similar performance, but with a slightly different character and interior. Even within Ford’s lineup, exploring all Ford fuel economy data reveals that EcoBoost-powered Mustangs offer significantly better fuel economy, however, they lack the aural symphony delivered by the 5.0L Coyote engine. Considering MUSTANG MPG across all years also highlights design choices that change MPG estimates.

Tips to maximize efficiency

Smooth and steady acceleration is key. The Mustang’s strong engine doesn’t need to be pushed hard to deliver enjoyable performance. Gentle acceleration from a standstill and anticipating traffic flow minimizes fuel waste. Avoid abrupt starts and stops whenever possible.

Maintain consistent highway speeds. Using cruise control on long stretches of highway helps prevent unintentional speeding, which rapidly decreases fuel economy. Also, try to avoid unnecessary lane changes that require bursts of acceleration.

Regular maintenance is essential. Ensure your Mustang’s engine is properly tuned, the tires are correctly inflated, and the air filter is clean. These simple steps can improve fuel economy by a few percentage points, translating to significant savings over time.

Limit idling. Excessive idling wastes fuel. If you’re stopped for more than a minute, turn off the engine. Modern engines, including the Mustang’s 5.0L, are designed to restart quickly and efficiently.

Consider your route. Plan your trips to avoid congested areas and prioritize routes with fewer stoplights. This can significantly reduce fuel consumption, especially in city driving.