2015 head-to-head · Two-Seater
2015 BMW Z4 vs Porsche 918 Spyder
MPG, range and what each one really costs you to fuel, from official EPA ratings and recalculated with your own gas and electricity prices.
AWD · 4.6L 8-cyl · 7-speed dual-clutch · 67 MPGe + 22 MPG
On fuel costs these two are nearly tied. Driving 15,000 miles a year with $3.95/gal premium gas and 18¢/kWh electricity, the most efficient 2015 BMW Z4 (26 MPG) costs about $2,279 a year to fuel and the 2015 Porsche 918 Spyder (67 MPGe + 22 MPG) about $2,259.
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 918 Spyder
Side by side
| BMW Z4 | Porsche 918 Spyder | |
|---|---|---|
| $2,279 | Your annual fuel cost | $2,259 |
| 26 MPG | Combined efficiency | 67 MPGe + 22 MPG |
| 22 MPG | City | 68 MPGe / 20 MPG |
| 32 MPG | Highway | 66 MPGe / 24 MPG |
| — | Electricity use (kWh/100 mi) | 50 kWh |
| — | Driving range | 420 mi |
| — | All-electric range | 12 mi |
| 345 g/mi | Tailpipe CO₂ (g/mi) | 277 g/mi |
| 6/10 | EPA fuel economy score | 7/10 |
| 6/10 | EPA greenhouse gas score | 8/10 |
| — | Charge time at 240V | 3 hrs |
| Gas | Powertrain | Plug-in hybrid |
| Premium gasoline | Fuel | Premium gas + electricity |
| 2.0L 4-cyl turbo | Engine / motor | 4.6L 8-cyl |
| 8-speed automatic | Transmission | 7-speed dual-clutch |
| RWD | Drivetrain | AWD |
✓ 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 918 Spyder across model years
- BMW Z4
- Porsche 918 Spyder
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 33 2015 two-seaters, the BMW Z4 ranks 10th and the Porsche 918 Spyder 7th for lowest fuel cost.
The powertrains differ: the BMW Z4 is a conventional gas model, while the Porsche 918 Spyder is a plug-in hybrid.
Frequently asked questions
Which is more fuel-efficient, the 2015 BMW Z4 or the 2015 Porsche 918 Spyder?
Measured by cost to drive, the Porsche 918 Spyder. The BMW Z4 is rated 26 MPG combined and the Porsche 918 Spyder 67 MPGe + 22 MPG (EPA, most efficient configuration of each).
How much does it cost to fuel the 2015 BMW Z4 vs. the Porsche 918 Spyder per year?
At 15,000 miles a year with $3.95/gal premium gas and 18¢/kWh electricity, about $2,279 for the BMW Z4 and $2,259 for the Porsche 918 Spyder.
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