i used tesco's fuel once in my old volvo v40 and noticed a slight hesitation at times.i always use sainsburys fuel now and had no problems.i read they are still using e5 and not e10 i do use a fuel additive too.whether it really makes a difference i dont know but i have put fuel in twice without additives and never noticed any difference.i dont use sainsburys best diesel(v power)but may use it if convinced on here,and if it means i no longer need to ad additives