Many factory air craft engines have 7k + red lines, from the shell oil definitions 110LL is 100 octane @ an A/F ratio of 14.7 and 130 octane @ a A/F of 12.5, I think that 2700 RPM is the ave cruise used for the 150 hr design test from the FAA, some good info on oils on the air craft sites also Ooops typo its 100ll not 110, I cant type in the dark