Gujarat petrol VAT is 13.70% VAT; diesel is 14.90% VAT. City rates below are pump prices, so this VAT is already inside the number.
13.7% petrol VAT and 14.9% diesel VAT, plus a town cess in many urban areas.
Lower VAT is why Ahmedabad and Surat usually beat coastal metros.
Lowest petrol in Gujarat here: Surat at ₹101.70. Gaps inside the state are usually freight, not a second VAT.
How central excise and state VAT stack