* Average cars: Most passenger cars of the era had top speeds in the range of 60-70 mph (97-113 km/h). However, maintaining those speeds for extended periods wasn't always practical or comfortable due to engine limitations and road conditions.
* High-performance cars: Some higher-end or performance-oriented models could reach speeds closer to 80-90 mph (130-145 km/h), though again, sustained speeds at that level were less common.
* Important factors: Factors influencing top speed included engine size and horsepower, aerodynamics (which were less refined than in later decades), transmission gearing, and the overall weight of the vehicle. Road conditions and tire technology also played a role.
It's crucial to remember that these speeds represent *potential* top speeds under ideal conditions. Actual driving speeds were often much lower due to traffic, road quality, and speed limits (which were less strictly enforced and varied by location).