i use v-power most of the time but tescos 99 near the end of the month when im skint ( tesco pay at pump lets you fill up a full tank even if you only have a few quid in the account
)
went for a country lane run on sunday and found myself 60miles from home with the fuel light flashing, only station i could find had 95ron, stuck some in and set my car to 95ron map and i was shocked, car felt flat, boost felt lacking and overall no were near the power it makes on 99