Why Petrol not under GST?

Patrol and Diesel prices highest ever! 

Petroleum corporates taking us for a ride! Today the petrol costs around 80/- per litre and it is 85/- in Mumbai!  Why Petrol and Diesel alone out of GST? Government is looting the people! Let the voice of Indians go up demanding linking of petroleum and diesel to GST! - KR GS AIPRPA