Both Tesco and Sainsbury's now run tiered pricing on their forecourts: cardholders pay one price, everyone else pays a little more. The marketing suggests meaningful savings, but the pump-price gap is usually small and the headline promotions — 10p off a litre for spending £X in-store — come with strings attached. We looked at what a typical driver actually banks per fill-up, using DESNZ weekly road fuel prices and the AA Fuel Price Report as reference points, and where the schemes quietly stop being worthwhile.
How the two schemes actually work
Tesco Clubcard Prices at the pump launched in 2023 and now applies at most of the chain's roughly 500 forecourts. Scan the Clubcard (physical or in-app) at the pay point and you unlock a lower per-litre rate. Sainsbury's Nectar Prices at fuel works the same way at its filling stations, having rolled out from 2024. Neither scheme requires you to spend anything in-store to get the base discount — you just need the card.
On top of that, both retailers periodically run stackable coupons: Tesco's classic "5p off a litre when you spend £60 in one shop" and Sainsbury's equivalent Nectar-linked offers. Morrisons and Asda do not operate tiered pump pricing in the same way, though Morrisons' More card offers occasional 5p vouchers. Independents and motorway service areas are a separate market and typically sit well above supermarket prices.
What the discount is worth per litre
The everyday Clubcard and Nectar discount at the pump is modest. In our spot checks across 2024 and into 2025, the gap between the member and non-member price has typically sat between 3p and 6p per litre, occasionally stretching to 7p during promotional windows. It is not a fixed number — supermarkets adjust it against local competition — but 5p is a reasonable working average.
For a family hatchback with a 50-litre tank, a 5p/L discount is £2.50 per fill-up. A driver filling up weekly saves around £130 a year. That is real money, but it is a long way from the impression given by forecourt signage. The 10p-off vouchers are more generous per litre, but they require a £60 qualifying shop, so the true saving is only worth counting if you would have done that shop at that retailer anyway.
There is also the base price to consider. The AA and RAC Fuel Watch both consistently show supermarket forecourts pricing several pence below the UK average, so members are effectively getting a discount on an already competitive price. The catch is that a nearby non-supermarket site occasionally beats the supermarket even after the loyalty discount, particularly in rural areas.
When the schemes stop paying off
The economics wobble as soon as you have to drive out of your way. At UK average car efficiency of around 40 MPG, a 10-mile detour burns roughly 1.1 litres — call it £1.60 at current pump prices. That wipes out the entire 5p/L saving on a 30-litre top-up before you have even parked.
The 10p voucher route is more nuanced. If you were shopping at Tesco or Sainsbury's regardless, the coupon is essentially free money and can save £4–£5 on a full tank. If you are switching your weekly shop specifically to trigger the voucher, and the grocery basket costs more than your usual supermarket, the fuel saving can be eaten by higher food prices — a point Which? has made repeatedly in its supermarket comparisons.
Practical rules of thumb
For most UK drivers, the sensible approach is to treat the loyalty card as a default rather than a strategy. Carry both cards, use whichever forecourt you would have used anyway, and only chase a voucher deal if the qualifying shop is one you were going to do.
The verdict
Clubcard and Nectar fuel discounts are worth having, but they are not transformative. The everyday saving is a few pence per litre; the promotional vouchers are better but conditional. Neither justifies loyalty to a forecourt that is materially further away or pricier at baseline than a nearby alternative.
The bigger levers on your annual fuel bill remain the same ones we keep coming back to: tyre pressures, driving style, avoiding motorway service areas, and — for higher-mileage drivers — the choice of car itself. Loyalty pricing is a useful trim, not a fix.
The takeaway
Supermarket loyalty fuel pricing typically saves around 3p–6p per litre, or roughly £1.50–£3 on a standard fill-up. Stackable vouchers can push that higher but require qualifying spend. Use the cards by default, but do not drive out of your way to reach a Tesco or Sainsbury's forecourt — the detour fuel usually costs more than the discount. The schemes are a nice-to-have, not a substitute for choosing an efficient car and driving it sensibly.
