The coupon can be used at Tesco petrol stations across the UK on petrol or diesel, and the offer is valid until Sunday, August 23. 5 Tips to make your fuel last longerA Tesco spokesperson said: "Tesco operates more than 500 filling stations across the UK and offering a discount on the price of fuel is just one way in which Tesco is helping its customers this summer. "The supermarket recently launched Freebie Thursdays, giving away millions of coupons for free products to Clubcard members, alongside extending its Kids Eat Free offer at The Café at Tesco." To redeem the offer, customers must present a printed coupon at the kiosk. The offer comes alongside other summer promotions, including Freebie Thursdays, which gives Clubcard members free product coupons, and extending its Kids Eat Free offer at The Café at Tesco.