Should I use premium or regular gasoline in my 2025 Audi A6?
Use premium gas with 91+ octane in your 2025 Audi A6. Audi requires it for every trim. Turbocharged engines need high-octane fuel to reach full performance.
Why Your A6 Needs Premium Gas
Turbo engines create high pressure in the cylinders. Premium gas with 91 to 93 octane prevents early ignition, called knock. Knock damages engines over time. Regular 87 octane gas burns too fast in these engines.
The 2025 A6 offers two turbo engines. Both require premium fuel:
| Engine | Size | Horsepower | Torque |
|---|---|---|---|
| 45 TFSI | 2.0L turbo 4-cyl | 261 hp | 273 lb-ft |
| 55 TFSI | 3.0L turbo V6 | 335 hp | 369 lb-ft |
Check your fuel cap or owner's manual. It states premium fuel. Audi sets this for most turbo models like the A6.
Risks of Using Regular Gas
Your A6 starts on regular gas for short drives. Knock sensors detect problems and reduce power. You lose horsepower and torque. Fuel economy drops. Turbo boost lags, and timing slows. Long-term use wears the engine faster.
In emergencies, mix a small amount of regular gas. Fill with premium at the next stop.
Benefits of Premium Gas
Premium fuel gives these advantages:
- Full power: 261 hp in 45 TFSI or 335 hp in 55 TFSI.
- Best mileage: Up to 33 mpg highway on 45 TFSI.
- Cleaner burn lowers emissions.
- Detergents keep injectors and valves clean.
Premium costs 20 to 50 cents more per gallon than regular. Engine or turbo repairs run $5,000 to $10,000. Premium saves money long term.
Fuel by Trim
All 2025 A6 trims need premium:
| Trim | Engine Options |
|---|---|
| Premium/Premium Plus | 45 TFSI or 55 TFSI |
| Prestige | 55 TFSI |
Tips to Get the Most from Your Fuel
- Choose Top Tier premium gas with 91+ octane. It cleans your fuel system best.
- Use apps to find cheap stations nearby.
- Drive smoothly. Accelerate gently and brake easy to raise mpg.
- Track fill-ups in Sidekick. It shows your real mpg and yearly fuel costs.
Stick to premium gas. Your A6 performs at its best and lasts longer.