· Super Moderator
I think it depends on your car; some cars are more sensitive than others. I could easily decipher the difference between E10 and E5 on my 118i.Those of you with a std engine tune on this thread, can you honestly tell me you can detect the difference in performance or smoothness with E5 or E0 99 Ron vs E10 95 Ron?
After I upgraded to a 420d, we gave the 118i to my mother. My father fills up all the cars with petrol/diesel for the week, and did so for my mother also. A few weeks later she asked me why her car wasn't driving the way it did when I gave it to her - turned out my father had been filling E10 all that time and since then she's never let him fill up with E10 again.