Even in states which have not cut VAT rates, prices have fallen more than Rs 5 and Rs 10 per litre for petrol and diesel

Fall in price (Rs per litre) of petrol and diesel between November 3 and November 4, 2021

Because most state taxes are ad valorem in nature, the tax component comes down when the base price (it includes central taxes and dealers' commission) comes down
Source: PPAC, Ministry of Petroleum Get the data