However this makes a big difference the zed is design for high RON fuel (100RON) which is readily available in the JDM 0r germany, so to make stated power or avoid the loss thereof by using lower octane fuel it makes sense to go as high as possible.
Currently only Tesco and BP do this and i use both at every opportunity! BP is overpriced when you consider it only a 97RON and the rest is crap because the fuel is stale or has crap additives !!
There was an independent controlled test on EVO magazine a while back, comparing the popular ultimate fuels from all the big players and Tesco 99 was tops
You also have the added advantage of 5p off if you spend £50 or above instore and collecting plus points;)
Shell v-power club points can be exchanged for airmiles or other stuff but i have to say unless you spend more time at their pumps you are never going to fly anywhere meaningful in a hurry
the only thing i struggle to see in any of these fuels is more mileage for unit volume