Mercedes-Benz AMG GT vs Porsche Cayman
The Porsche Cayman is the more efficient of the two: it reaches 25 mpg combined versus 22 mpg for the Mercedes-Benz AMG GT, a 3 mpg advantage and costs about $400 less per year to fuel.
Across 5 measured categories, the Porsche Cayman leads in 5. Figures are EPA test data, not manufacturer claims.
2016–2027
Mercedes-Benz AMG GT
Two Seaters · 67 configurations
Head-to-head specifications
| Metric | Mercedes-Benz AMG GT | Porsche Cayman |
|---|---|---|
| Best combined MPG | 22 mpg | 25 mpg ✓ |
| Best city MPG | 20 mpg | 22 mpg ✓ |
| Best highway MPG | 27 mpg | 31 mpg ✓ |
| Lowest annual fuel costEPA estimate at 15,000 miles per year | $3,450 | $3,050 ✓ |
| Lowest CO2 output | 397 g/mi | 352 g/mi ✓ |
| Engines offered | SIDI, SIDI; Mild Hybrid, SIDI; PHEV | SIDI |
| Transmissions | Automatic 9-spd, Automatic (AM7), Automatic (AM-S7) | Manual 6-spd, Automatic (AM-S7) |
| Drivetrains | All-Wheel Drive, Rear-Wheel Drive, 4-Wheel Drive | Rear-Wheel Drive |
| Fuel types | Premium, Premium and Electricity | Premium |
| EPA class | Two Seaters | Two Seaters |
| Years covered | 2016–2027 | 2015–2020 |
| Configurations on record | 67 | 35 |
Source: EPA fuel economy records via fueleconomy.gov. Best-case values across all recorded configurations for each model.
AMG GT vs Cayman: common questions
Which is better on gas, the Mercedes-Benz AMG GT or the Porsche Cayman?
The Porsche Cayman is the more efficient of the two: it reaches 25 mpg combined versus 22 mpg for the Mercedes-Benz AMG GT, a 3 mpg advantage and costs about $400 less per year to fuel.
Which costs less to run per year?
By EPA estimates at 15,000 miles a year, the Porsche Cayman runs about $3,050 a year in fuel at its most efficient configuration, versus about $3,450 for the Mercedes-Benz AMG GT — a difference of roughly $400 per year.
What engines do the AMG GT and Cayman offer?
Mercedes-Benz AMG GT: SIDI, SIDI; Mild Hybrid, SIDI; PHEV. Porsche Cayman: SIDI.
Are they in the same vehicle class?
Yes — the EPA classifies both the Mercedes-Benz AMG GT and the Porsche Cayman as Two Seaters, so they compete directly.
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