The ACCC inquiry into petrol prices will hold a public hearing in Adelaide tomorrow (Tuesday, April 30).

The inquiry will hear evidence from the Australian Institute of Petroleum, the RAA, the farmers' and service station associations. Several disaffected service station operators will give evidence too. One of Adelaide's main discounters will tell the hearing about his relationship with one of the oil majors and the supply difficulties he has encountered.

The inquiry is reviewing the present method of regulating wholesale petrol prices throughout Australia. The oil majors have already presented their case and are arguing for deregulation of petrol prices.

The Commission is also examining the disparity between city and country prices and has been asked to recommend any measures that might sharpen competition in rural markets. The ACCC is scheduled to submit its report to the Commonwealth Government by July 31.

Details of the Adelaide hearing are: Time: 10am, Tuesday, 30 April Location: Royal Coach Motor Inn Dequetteville Terrace Kent Town