Maruti's tried and tested K10B engine came with the Celerio X, a tried and tested engine being one known for its peppy nature and good low end torque. As they introduced the new generation Celerio, the new K10C DualJet engine that Maruti introduced also offers better fuel efficiency and meets stricter emission norms. But some enthusiasts say the older K10B, even if less efficient, made for a more fun driving experience, particularly in the sportier looking Celerio X. As a result, this has led to much debate about whether the quest to make newer models more efficient has come at the expense of driving enjoyment, especially in the low seating position small urban cars, where a feisty engine can make all the difference when it comes to overall driving experience.