Just found this on Martins money saving website

What's the Deal?

If you spend £50 in Tesco before 24 February, whether online or in store, you'll currently receive a voucher for 5p off per litre of petrol, diesel or LPG.

What do I need to do?

Just spend over £50 and the voucher should be printed out with your receipt. If you don't get one, ask a member of staff. The voucher can be easy to miss, especially if you've used the self scan tills.

To use it, just hand over the voucher when you next fill up provided it's within 14 days (check your voucher for its validity date).

Any other terms and conditions?

In store you won't get the voucher on purchases made in Tesco Direct, cafes, petrol stations, and tobacco kiosks, nor when the money's spent on the Lottery, gift vouchers, stamps, glass hire, nutricentre, prescription medicines, infant

formula and fireworks.

When your spend's online you'll only get the voucher if its via the grocery part of the site.

The 5p off voucher is valid on a maximum of 100 litres per voucher, and can't be used when you've opted to pay at the pump - plus there's no second chance to get the cash off, so don't forget to use it!

The promotion's not on at Tesco Expresses or in the Republic of Ireland, Isle of Man, Brigg, Porthmadog,

Rawtenstall, Consett, Market Weighton or Calais.

This offer has been off and on for months in my local store.

Yes same in mine

You spend £50 with them and they give you £2 off a tank full!

Shame I use Optimax

Same here. " Every little helps!!"

I get 33mpg on Shell / Esso petrol and only 30mpg on Tesco. Thats 10% more mpg tested over 8 months. Had the same difference in winter when I had the diesel Fabia.

I always thought 5ppltr was good ( 22.5ppg for us old folk) but it still doesn't equate to 10% worse fuel economy so I'll stick with a oil major and help their profits.