I have just started to run E85 in my daily drive s13 with a stock ca18det in it and I love it...
The car was dynoed to 285HP at the hubs at 1,3 bar boost on normal fuel, then a remaped chip for e85, 1,35 bar and 352hp and over 100nm more then normal fuel, and this on a small GT28R turbo. This is meaured on a dynapack btw.
The car runs cooler, but uses a lot more fuel when I use it hard.
Al in al its a very good fuel I think, alo smells better...
I am sertanly using it for my R32gtr when the rb30 is ready.