Petrol and diesel prices have marginally increased from Friday midnight consequent to a corresponding hike in the commission for petroleum dealers by the Union Ministry of Petroleum and Natural Gas. Revision In the city, the increase of three paise on petrol, taking the retail price of a litre of the fuel to Rs.49.64 and four paise on diesel, resulting in the price going up to Rs.34.44, however, has not cheered the dealers. They complained that the quantum of the upward revision of commission fell short of their expectations. Protest The last time their commission was increased was in May last year from Rs.894 to Rs.1,024 on a kilolitre of petrol and from Rs.529 to Rs.600 on diesel. Even that was given after the dealers protested against the insufficient quantum of upward revision