I now use pay at pump only so i can go in, fill and out fast. I did notice Tesco were offering vouchers but my car tank is about 35 litres and tops up about every 6 weeks as the car averages 60mpg.
Next car will be under 40mpg but not dependant on the 12 volt battery that fails a lot on the Toyota.
Tesco momentum is really good fuel for old bikes and i also use it in the new car as mpg goes a lot better on that fuel when using the Toyota Atkinson cycle engine. The 2 litre version uses less than the low powered 1.8 litre.