If you’re worried about the o2 sensors, you can just mix in unleaded race gas with your e10 instead of leaded.
The more I think through this, the less I wanna rely on any of the OTC pour-in products. I may have one bottle on hand for an EMERGENCY (whatever the He11 that would be), but believe what we'd talked about before where I don't thrash it too hard on the street w/ straight pump 93 E10, but dump in a 5-gallon can of "the good stuff" when I get near the track to prepare for flogging it w/o concern.
Locally available UNleaded race fuel in 5-gal cans:
--> Sunoco GT 100 (10% ethanol; 14.1 stoich, same as 93 E10)
--> Sunoco GT Plus 104 (13% ethanol; 13.7 stoich)
Cost difference is virtually nothing for 5-gallons of either, so the GT Plus 104 is a better bang for the buck to get the octane up:
--> GT - 98 Octane = 2.5 gal 100 for each gal 93 --> Add 5 gals to 2 gals 93 for 7 gals 98
--> GT Plus - 98 Octane = .8+ gal 104 for each gal 93 --> Add 5 gals to 6 gals 93 for 11 gals 98
