[CamaroCracka]

You have to do the cost benefit analysis for yourself. Anyone running boost can see big benefits by running e85. For those not running boost, my rule of thumb would be if the use of race fuel would ever be required. $3/gal e85 beats the hell out of $10/gal (or more) race fuel.

How you do it is also a big determinant of the return. Do you intend to pay 1k for a DSX kit or can you get by with ZL1 pump (or modify yours with a Deatschwerks replacement) and a Continental fuel composition sensor >$100? Are you doing the work, or are you paying someone? If you can do it yourself, including adding the pin to the ECM connector, then the biggest cost is the tune change.

If you have no need for 105 octane fuel, it's probably not worth the effort unless you believe the zombie apocalypse is coming and you will need to make your own liquor, I mean fuel.