NEW DELHI: Oil consumers have so far got only a fraction of the steep fall in crude prices. Brent crude has dropped about 40% since June, but the price of petrol diesel , jet fuel and commercial LPG have fallen barely 8%-17%. Prices are down 17% for commercial cooking gas, 14% for aviation turbine fuel (ATF), 11% for petrol, and 8% for diesel.Executives of state-run oil firms said the price movement of international crude oil and global petroleum products are often not same. International crude prices fall faster than global prices of petroleum products on which domestic retail prices of petrol, diesel, ATF and cooking gas are based, they said.State oil marketing companies have slashed non-subsidised cooking gas prices by Rs 113 per cylinder and ATF by Rs 2,594.93 per kiloliter from Monday. On Sunday, companies slashed petrol rates by 91 paise per litre in the seventh consecutive cut in four months. Diesel prices fell by 84 paise, which is the third price cut since October 18.Petrol pump dealers and gas agencies suspected that state oil companies are keeping some margin or the government is using that price cushion to reduce their fiscal burden.According to government and industry sources, oil companies did not cut petrol and diesel rates in mid-November despite the Centre mopping up Rs 1.5 per litre from petrol and diesel to meet its fiscal deficit target. So far, the government is able to reduce its fuel subsidy burden to below Rs 50,000 crore, sources said. “Pricing of petroleum products are not very transparent and the government should allow an independent regulator to fix and monitor prices, especially when state refiners have near monopoly on sale of auto fuels,” a senior executive of a private sector oil company said.Industry officials say an independent regulator should monitor fuel prices.