4 speed autos don't perform well in high speed scenarios. Highway use is fine, better than the 3spd that maxes out at 100km/h. The 4 spd auto maxes out at 120km/h i think. 80km/h is the sweet spot. As for fuel consumption in city, it depends on traffic conditions and how well maintained the car is. Expect 14-17km/l out of it. CVT's can go upto 20km/l and are better on the highway.