And the NRMA fears this could breach the highest price on record of 169.5 cents per litre today.
This figure was recorded in 2008 in the lead up to the global financial crisis.
The NRMA said across Greater Sydney, 42 per cent of service stations are selling regular unleaded for 177.9 cents per litre, which is 10 cents above the average.
The bottom 10 per cent of service stations are selling regular unleaded for between 132.6 and 143.9 cents per litre.
The gap between the cheapest and most expensive service stations across Sydney is currently 47 cents per litre, which is equivalent to a price difference per tank of $26 for a typical family sedan.
NSW petrol prices are following a national trend of record-breaking highs over the last month with Sydney on track to join Brisbane, Adelaide and Perth, which all record the highest ever average prices.
Regional centres have also recorded higher than average prices across the Central Coast, South Coast and Hunter Valley.