Audi S5 vs BMW i4
The BMW i4 is the more efficient of the two: it reaches 120 mpg combined versus 24 mpg for the Audi S5, a 96 mpg advantage and costs about $2,500 less per year to fuel.
Across 4 measured categories, the BMW i4 leads in 4. Figures are EPA test data, not manufacturer claims.
Head-to-head specifications
| Metric | Audi S5 | BMW i4 |
|---|---|---|
| Best combined MPG | 24 mpg | 120 mpg ✓ |
| Best city MPG | 21 mpg | 122 mpg ✓ |
| Best highway MPG | 30 mpg | 119 mpg ✓ |
| Lowest annual fuel costEPA estimate at 15,000 miles per year | $3,150 | $650 ✓ |
| Lowest CO2 output | 363 g/mi | Not available |
| Engines offered | SIDI | Not available |
| Transmissions | Automatic (AM-S7), Automatic (S8), Automatic (AM-S8) | Automatic (A1) |
| Drivetrains | All-Wheel Drive, 4-Wheel Drive | All-Wheel Drive, Rear-Wheel Drive, 4-Wheel Drive |
| Fuel types | Premium | Electricity |
| EPA class | Subcompact Cars | Subcompact Cars |
| Years covered | 2015–2026 | 2022–2026 |
| Configurations on record | 33 | 33 |
Source: EPA fuel economy records via fueleconomy.gov. Best-case values across all recorded configurations for each model.
S5 vs i4: common questions
Which is better on gas, the Audi S5 or the BMW i4?
The BMW i4 is the more efficient of the two: it reaches 120 mpg combined versus 24 mpg for the Audi S5, a 96 mpg advantage and costs about $2,500 less per year to fuel.
Which costs less to run per year?
By EPA estimates at 15,000 miles a year, the BMW i4 runs about $650 a year in fuel at its most efficient configuration, versus about $3,150 for the Audi S5 — a difference of roughly $2,500 per year.
What engines do the S5 and i4 offer?
Audi S5: SIDI. BMW i4: no engine data on record.
Are they in the same vehicle class?
Yes — the EPA classifies both the Audi S5 and the BMW i4 as Subcompact Cars, so they compete directly.
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