2020 head-to-head · Two-Seater
2020 BMW Z4 vs Porsche Cayman
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 2020 BMW Z4 is the cheaper one to run. Driving 15,000 miles a year with $3.95/gal premium gas, it costs about $2,194 a year to fuel (27 MPG), versus $2,469 for the 2020 Porsche Cayman (24 MPG). That's roughly $274 a year, or about $1,372 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 Cayman
Side by side
| BMW Z4 | Porsche Cayman | |
|---|---|---|
| $2,194 | Your annual fuel cost | $2,469 |
| 27 MPG | Combined efficiency | 24 MPG |
| 24 MPG | City | 21 MPG |
| 32 MPG | Highway | 27 MPG |
| 324 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 Cayman across model years
- BMW Z4
- Porsche Cayman
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 39 2020 two-seaters, the BMW Z4 ranks 5th and the Porsche Cayman 10th for lowest fuel cost.
Frequently asked questions
Which is more fuel-efficient, the 2020 BMW Z4 or the 2020 Porsche Cayman?
Measured by cost to drive, the BMW Z4. The BMW Z4 is rated 27 MPG combined and the Porsche Cayman 24 MPG (EPA, most efficient configuration of each).
How much does it cost to fuel the 2020 BMW Z4 vs. the Porsche Cayman per year?
At 15,000 miles a year with $3.95/gal premium gas, about $2,194 for the BMW Z4 and $2,469 for the Porsche Cayman.
BMW Z4 vs Porsche Cayman in other years
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