[240 2NR]

The blackbird also has to be refueled just after takeoff because the expansion undergone at mutiple mach speeds is so great that it is impossible to seal the fuel tanks, so while on the ground and durning takeoff will weep almost half its supply.


There is too much of a good thing and while a stock 240 may run on 100+ octane (I think over 108 conatins lead so it's a no no for cat equipped cars), it's probably not making any more power and is probably making less.  Remember that even when nissan specifies 91 octane be used, it is still idiot proofed for people who run 87 (though again, power may not be ideal).  

As for a tank of octane booster.  I wouldn't try it as I don't think it conatins any gasoline, just like a full tank of any other fuel addative would probably not result in favorable engine output.