Exemption on blended fuel available when excise on petrol and GST on ethanol are paid timely, even if blending occurs in refinery. Exemption from Basic Excise Duty and applicable cesses on ethanol/methanol blended petrol and bio diesel blended diesel is available only if excise duty (and cesses) is paid on the portion of motor spirit in the specified blend and applicable GST is paid on the ethanol/methanol portion, and the blended petrol meets the prescribed BIS specification. These conditions are satisfied even when blending occurs within refinery premises provided duties and GST are paid by the due date on clearance and proper accounts of blending and tax paid are maintained for verification.