3. Fuel efficiencyThe new Alto 800 comes with various engine tweaks that add to more power, torque and fuel economy. The compression ratio of the engine has been changed along with lightweight pistons, connecting rods and crankshaft. These changes will improve the overall fuel efficiency – at 22.7kmpl! as compared to 19.73kmpl (ARAI figures) registered by its outgoing predecessor. Thus, expect a real world mileage figure of about 16-17 Kmpl in the city while highway runs should see an average of 20 Kmpl. The CNG version of model is promised to deliver mileage to the tune of 30.46km per kg of CNG, which makes it one of the most economical to operate not to mention one of the cleanest small cars there is in the country.