Fuel quality comparisons are rather old hat and a rather subjective and unsubstantiated subject - been going on for years. I get my fuel from the last source to give me a discount whatever. Yes I've used Tesco - Sainsbury - Morrisons - Asda [when I don't have a voucher as they are the cheapest in town anyway]. I have even used Shell with vouchers from Waitrose, BP and Esso with discount offers. My challenge at the end of the day is, study my Auris MkI HSD consumption data over the 28 months of use and then tell me what fuel I used based on the consumption figures. Result = you won't be able to because the fuel source is immaterial. For hybrids the important factors are ambient temperature, journey topography, driving techniques, and tyre pressures, and forget about playing with the three "performance" buttons they are a complete waste of space. But this is a society of freedom of choice, so if you convince yourself that divesting yourself of extra dosh gives you added benefits then that is your choice, far be it for me to deny that to anyone. Cheers TerryB