
The difference between Audi 40 and 45 lies in the power of the engines equipped in the cars: the 40 model is equipped with a 2.0T low-power turbocharged engine, while the 45 model is equipped with a 2.0T high-power turbocharged engine. This engine features hybrid injection technology, uses an aluminum cylinder head and cast iron cylinder block, and is paired with a 7-speed dual-clutch transmission. The 40 TFSI model has a maximum power of 140 kW and a peak torque of 320 Nm, while the 45 TFSI model has a maximum power of 165 kW and a peak torque of 370 Nm. In terms of the transmission system, the new car series comes standard with a 7-speed DSG transmission, and the 45 TFSI and 55 TFSI models are also equipped with the quattro ultra intelligent four-wheel drive system.

As a car enthusiast who frequently test drives various Audi models, I find the main differences between the 40 and 45 versions lie in performance and power. The 40 version typically has an engine output ranging from 190 to 204 horsepower, delivering a smooth driving experience for daily use. It accelerates from 0 to 100 km/h in about 8 seconds, with relatively low fuel consumption—around 7 liters per 100 km in urban areas—making it suitable for users who don't demand high driving excitement. On the other hand, the 45 version boasts up to 249 horsepower, offering noticeably quicker acceleration, easily achieving 0-100 km/h in under 6 seconds. It feels particularly exhilarating on highways or during overtaking, though fuel consumption rises to around 8 liters. Additionally, the 45 version features a more sporty system tuning, with more agile suspension response and stronger grip in corners. However, it costs about 50,000 to 60,000 RMB more. For those who appreciate that thrilling sensation, I think the extra cost is well worth it. If you have a generous budget and love driving fast, the 45 is the better choice.

From a practical perspective of an average driver, having driven the Audi 40 for many years, I've noticed that the key differences between it and the 45 lie in economy and convenience. The 40 version is more affordable, with average fuel consumption about 1 liter lower per 100 km, making it more economical for city commuting and daily use. Maintenance costs are also lower, and parts are easier to find. While its power is modest, it's perfectly adequate for daily commutes or school runs, with smooth acceleration and high comfort. The 45, on the other hand, offers stronger power and noticeable acceleration, ideal for long highway drives, but at the cost of higher fuel consumption, especially in traffic, and slightly higher insurance premiums. I believe the choice depends on your driving habits: if most of your driving is in the city, the 40 offers better value; if you frequently drive on highways, the 45's extra performance provides a more relaxed driving experience.

As a family-oriented driver who prioritizes comfort, I've compared the Audi 40 and 45 models and found the main difference lies in the balance of power. The 40 has slightly weaker horsepower output with gentler acceleration, and its chassis tuning is softer, resulting in less vibration on bumpy urban roads, making it more comfortable for driving with kids or shopping trips. The 45 offers significantly stronger power with noticeable acceleration push, but its suspension is stiffer, which might lead to more fatigue during long drives. In terms of fuel consumption, the 40 is more economical, averaging one or two liters less, thus lowering maintenance costs. From my experience, if you seek a smooth and relaxed driving experience, the 40 is perfectly adequate; but if you occasionally crave some excitement, the thrill from the 45 is worth it.


