I have been reading quite a bit about the benefits of tuning with E85/100 oct/meth/h20.

Since many people are only running 650-750 cc injectors, why not tune for a blend of 91 and E85 for which those injectors can handle the increased consumption requirements?

Given my setup with denso 720's/walbro 255, I could probably blend 50/50 (effective octane of around 97 octane) run a couple more psi and more timing throughout, while also passing smog with HKS 272 cams/HFC and not smelling like I'm running E85.

Many of the benefits without upgrading to wild injectors and compromising 91 drivability.

Any issues here with E47.5?

 

Yeah, one issue stands out in particular -- inconvenience.