There's been a struggle with street cars turn race cars and which gas to run. We all know both e85 and 110 work. SO what do you run and what have you found? In my experience e85 can get me through ~25minutes in the oem tank, which can cut my race short in most cases.
In my mind It'll all depend on your budget.
Properly installed 20gal fuel cell ~3500
12 gallon well cell bridging the OEM tank ~ 1800
Custom surge tank ~ 800
Or Race gas
E85 x 40 gallons at 3.50 a gallon = $140 in fuel for the weekend
112+ x 40 gallons at 9.00 a gallon = $360 for the weekend
Lets say you do 8 events a year.
140x8 weekends = $1120 yr
360x8 weekends = $ 2880 yr
There's pros and cons to both. Gas consistency is always a player because you can get e70 or e90 from one day/station to the next. 112 octane is always going to be 112 octane. But E85 runs cooler, cleaner, easier on your o2's, more readily available to the public etc. Let's discuss.
Why are you limiting the conversation to just 112 and e85?
Where I live (NC) much of the regular(87) and mid grade(89) are diluted with ethanol, but the premium (91-93) isn't.