What are the differences between Audi A6 40 and 45?

[Juliette]

Audi A6 40 and 45 differ in terms of power performance, tire size, etc. Here are the specific details: Power Performance: Both the 40/45 models are equipped with a 2.0T turbocharged engine, while the 55 model features a 4.0-liter V8 turbocharged gasoline engine, currently mainly used in the Audi A8L. The 40T, as the entry-level powertrain, offers a maximum output of 190 horsepower, 140 kW power, and 320 Nm torque. In contrast, the 45T provides a maximum output of 224 horsepower, 165 kW power, and 350 Nm torque. Additionally, the maximum torque RPM tuning differs between the two. The 40T ensures sufficient power for daily commuting, while the 45T offers more robust power assurance. Both models are paired with a 7DCT dual-clutch transmission. Despite the Audi A6L's large size, its fuel consumption ranges from 9-10L per 100 km. Tire Size and Wheel Design: As an entry-level model, the 40T comes with 225-55/R18 tires, and the base wheel features a somewhat plain 10-spoke design in a slightly white finish, which is relatively simple. The 45T/55T entry-level models share the same tire size as the 40T, but mid-to-high trims offer larger 245-45/R19 and 255-40/R20 tires with smoked black wheels. These upgrades significantly enhance both visual appeal and grip. However, the wider tires and lower aspect ratio inevitably lead to increased fuel consumption. Nevertheless, thanks to the improved grip, the mid-to-high trims of the 45T/55T deliver a superior driving experience.

[SanFinley]

The main difference between the Audi A6 40 and 45 TFSI lies in their performance, which I’ve personally experienced after driving both. The 40 version delivers around 190 horsepower, offering smooth starts but slower acceleration, making it ideal for city commuting—especially in traffic with lower fuel consumption. The 45 version, however, boosts horsepower to approximately 270, delivering powerful performance with strong acceleration and effortless highway overtaking, though it consumes more fuel. For daily driving, the difference is minimal, but speed enthusiasts should opt for the 45. The interiors are nearly identical, with similar suspension tuning and almost identical maintenance costs—only the 45’s quicker acceleration adds more fun. Long-term, the 45 holds slightly better resale value, though its advantages are less noticeable in congested areas.

[DeAlan]

From an economic perspective, I saved a lot on fuel costs with the Audi A6 40, which has a fuel consumption of about 6L/100km. In comparison, the 45 model consumes over 8L/100km, costing thousands more in fuel annually for long-distance driving. In terms of power, the 40 is weaker but sufficient for family use—acceleration isn’t fast but stable, while the 45 offers stronger output, making it suitable for frequent highway driving. The configuration differences are minimal; both come standard with a panoramic sunroof and a comfortable chassis. The 45 is more expensive but accelerates faster. When buying, prioritize your needs: if mainly for city driving, the 40 offers better value for money, saving you unnecessary expenses; opt for the 45 if you frequently drive long distances.

[RowanLynn]

Both the 40 and 45 models use a 2.0T engine, but from my 20 years of experience with cars, the 40's power is tuned down to 190 horsepower with slower turbo response, while the 45 is boosted to 270 horsepower with optimized intake and ECU, achieving a 0-100 km/h acceleration in just five to six seconds. The difference is noticeable in daily driving, with the 45 delivering stronger output. Fuel consumption is slightly higher for the 45, but structurally there's no difference, and the chassis and suspension are identical. When choosing a car, don’t just focus on power—the 40 is more affordable and practical, especially for family use.