Another benefit
Though the use of 100LL has always been allowable in aero engines with a minimum octane rating requirement of 80, lead fouling of the spark plugs has been a problem in low compression engines. With no TEL in 100UL, it seems the lead fouling problem with these engines would also be solved. No more need to add TCP to 100LL to aid in the scavenging of lead.
With Shell mentioning the possibility of licensing the formula to other producers, this really begins to look like a very positive development for avgas users.
westhawk