2021 head-to-head · Two-Seater
2021 BMW Z4 vs Porsche 718
MPG, range and what each one really costs you to fuel, from official EPA ratings and recalculated with your own gas and electricity prices.
The 2021 BMW Z4 is the cheaper one to run. Driving 15,000 miles a year with $3.95/gal premium gas, it costs about $2,116 a year to fuel (28 MPG), versus $2,469 for the 2021 Porsche 718 (24 MPG). That's roughly $353 a year, or about $1,763 over five years.
Your numbers
Change these to match your driving and local prices. Every figure and chart on this page updates.
Fuel cost over 10 years
- BMW Z4
- Porsche 718
Side by side
| BMW Z4 | Porsche 718 | |
|---|---|---|
| $2,116 | Your annual fuel cost | $2,469 |
| 28 MPG | Combined efficiency | 24 MPG |
| 25 MPG | City | 21 MPG |
| 32 MPG | Highway | 27 MPG |
| 321 g/mi | Tailpipe CO₂ (g/mi) | 375 g/mi |
| 6/10 | EPA fuel economy score | 5/10 |
| 6/10 | EPA greenhouse gas score | 5/10 |
| Gas | Powertrain | Gas |
| Premium gasoline | Fuel | Premium gasoline |
| 2.0L 4-cyl turbo | Engine / motor | 2.0L 4-cyl turbo |
| 8-speed automatic | Transmission | 7-speed dual-clutch |
| RWD | Drivetrain | RWD |
✓ marks the better value. EPA scores run 1–10 (10 is best). Volumes come from the EPA interior volume index and aren't published for every body style.
BMW Z4 vs Porsche 718 across model years
- BMW Z4
- Porsche 718
Annual fuel cost of the most efficient configuration of each model year, at your prices. Click a point to open that year.
How they differ
Among 27 2021 two-seaters, the BMW Z4 ranks 3rd and the Porsche 718 6th for lowest fuel cost.
Frequently asked questions
Which is more fuel-efficient, the 2021 BMW Z4 or the 2021 Porsche 718?
Measured by cost to drive, the BMW Z4. The BMW Z4 is rated 28 MPG combined and the Porsche 718 24 MPG (EPA, most efficient configuration of each).
How much does it cost to fuel the 2021 BMW Z4 vs. the Porsche 718 per year?
At 15,000 miles a year with $3.95/gal premium gas, about $2,116 for the BMW Z4 and $2,469 for the Porsche 718.
BMW Z4 vs Porsche 718 in other years
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