For the past two years, my LCR has supped now't but Shell V-Power (99RON).
However, because there's a paucity of Shell stations in my local area - nearest is 23 miles - I've had to resort to Sainsbury's Super Unleaded (97RON).
Curiously, two tanks later, there's no change in performance and I get an extra 3mpg on a long run. (In the past, when I swapped from 97RON to 95RON the performance drop-off was marked and immediate.)
And Sainsbury's brew is 8p/litre less.
Any thoughts?
Ta
However, because there's a paucity of Shell stations in my local area - nearest is 23 miles - I've had to resort to Sainsbury's Super Unleaded (97RON).
Curiously, two tanks later, there's no change in performance and I get an extra 3mpg on a long run. (In the past, when I swapped from 97RON to 95RON the performance drop-off was marked and immediate.)

And Sainsbury's brew is 8p/litre less.
Any thoughts?
Ta