2021 Ford Mustang HO Convertible MPG & Specs — Real-World vs EPA, All Trims
Every trim takes regular — no premium needed.
Is the 2021 Ford Mustang HO Convertible good on gas?
At up to 22 MPG combined, the 2021 Ford Mustang HO Convertible is about average for a Subcompact Cars — that class averages about 22.8 MPG across 5,756 EPA-tested versions, so it's middle-of-the-road for its size.
Real-world MPG vs the EPA number
The EPA figures above come from a standardized dynamometer test, not the open road — real-world MPG typically runs a bit lower depending on your driving, climate and terrain. That's true of every car on this site, old or new.
At today's AAA national average price — $3.80/gal for regular gas as of 2026-07-05 — the most efficient trim runs about $2,591/year (roughly $216/month, about $17.27 per 100 miles) at the EPA's assumed 15,000 miles/year, using an estimated 682 gallons a year. We don't estimate a cost-per-fill since exact tank size isn't in the public EPA dataset, but the per-100-mile figure scales to any tank. Current national average gas prices →
2021 Ford Mustang HO Convertible trims & fuel economy
| Trim (engine / transmission) | Fuel | MPG | Fuel/yr (today's price) |
|---|---|---|---|
| 2.3L 4-cyl, S10 automatic, RWD | REGULAR | 22 | $2,591 |
| 2.3L 4-cyl, 6-spd manual, RWD | REGULAR | 21 | $2,714 |
2021 Ford Mustang HO Convertible specs
What the EPA test-car listings record for this model year — every combination sold is a row in the trims table above.
| Engine options | 2.3L 4-cyl turbo |
| Transmission | S10 automatic · 6-spd manual |
| Drive type | RWD |
| EPA body class | Subcompact Cars |
| Fuel | Regular |
| Tailpipe CO₂ | 404–415 g/mi |
Other years of the Ford Mustang HO Convertible
Similar cars (Subcompact Cars)
Cars that take premium · Cheapest cars to fuel · Where fuel grade depends on the trim · Fuel guides
2 trim(s) · EPA FuelEconomy.gov data retrieved 2026-07-24 · fuel prices AAA national average as of 2026-07-05.