I have my 7 booked in for a mapping session next month post an engine rebuild at DVA over the Winter. Never done anything like this before, so looking forward to it. However I’m in a bit of a quandary over fuel type… I always try and run my car on Super-unleaded, but am not precious of fuel brand etc. However on occasions, it’s not always possible to get Super-unleaded – the fish n chip run for example, where I might end up with a mixed tank of 95/99 octane. So, what do I fill the car up with for the mapping session? I want the car to run at its best when being fuelled by 99 octane, but also to run safely on 95 when needs be. I’ve spoken to the RR company and they’ve suggested using only 95 for the RR session if I want it to run safely on that fuel. But that is only for a small proportion of the time I drive the car. Another thought I’ve had is to have it mapped on 99, but to carry a bottle of octane booster to use on occasions when I can only put 95 in. Could that be a viable solution? Would welcome others thoughts on this. Thanks!