This is a discussion on Pump E85 vs E85R (ethanol race fuel) within the Focus RS Performance forums, part of the Focus RS Garage category; I had a friend contact me who said he is a distributor for One Ethanol R and S race fuel. I looked at their site ...
I had a friend contact me who said he is a distributor for One Ethanol R and S race fuel. I looked at their site and they have the R at "over 85%" ethanol rating with an octane rating of 117 and the S 85% ethanol rating with octane at 112. As I would mix 2 fuels to get to E30 regardless of content, is there any benefit to mixing with a race ethanol fuel? Is there even less knock potential for at the track or it just doesn't matter as I'm at E30 at the end.
Link to the product https://www.oneethanol.com/products
Mini primer on E85 vs E85R https://www.bumberas.com/blog/2018/4/30/e85-vs-e85r
Typically "race fuel" does not vary much to regular fuel apart from it being a much higher quality ie more consistent from batch to batch and made with more refined base fuels, which is more important during race applications. As @MikeT mentioned, I think all you'll be getting is a better quality E85 ie no need to test (as mentioned, pump E85 can range between E65-E85 depending on the brand/location).
If its only going to be for street use or performance driving (and not for competition) I think its not worth the price. Since you're mixing it with majority standard pump fuel anyway (which can range from E10-E15) you may still be not getting an exact E30 mix (unless you have an ethanol sensor)
I have a sensor so if it is accurate I can get it to E30. The guy may get me some samples so will be fun to try. If it's not going to help with "protection" then not worth buying. I only do HPDE's so not racing.
Michigan e85 can be as low as 51%. So I thinking it would help with consistency. And most octane for e85 here is 102. So I would guess you would gain some safety with higher oct. fuel could also be more fresh so it may keep a higher octane. I would use pump e on the street then at the track use the race stuff. I may pick some up myself before next track day for my edge and RS
The only benefit to using race fuel is consistency, and knowing exactly what you’re putting in the car. So if you buy c110 you know it’s going to be 110 every time. When you tune a very expensive race built motor to within an inch of its life, spending that bit more on small batch fuel is worth it