Q. Which car is best in driving? a)petrol or b)diesel. - i20?

See Brother it totally depend how much you daily drive the vehicle. If your daily running more than 40 - 80 km per day than you should definitely go for diesel one but if your daily drive just lower than it not worth to go for diesel. Even Era and Asta O version lot of good interior and feel good feature will be missing , if you go for era version... Reg. Diesel vehicles no idea about govt. plan for stop, but i think Govt. might be set less life cycle compare to petrol. Elite i 20 petrol version mileage are slightly lower side compare to any Maruti petrol vehicle like baleno, swift etc.. As i have Elite i 20 Asta O Petrol 2017 model and driving busy Bangalore city traffic gets around 11 -12 km in city & highway around 14 - 16 km depends driving pattern. You can easily get around 16 km with smooth driving on highway & 12 km in city with full time Ac.Even i gets same till now. Maintenance come around 5- 7 thousands with service interval 10000 km.

Petrol engine is best to drive but if u want average and pickup in car than u should go for diesel variant