The document provides tips for saving money on petrol/gas purchases. It recommends filling up in the early morning when the ground is cold to get the most accurate volume of petrol. It also advises pumping slowly to minimize vapors and shorting at the pump, and to fill up when the tank is half full to reduce air space and evaporation. The final tip is to avoid filling up during delivery to avoid dirt stirred up in the storage tanks. Sharing these tips could help many petrol buyers save money.