It sounds like you’ve done your research! It absolutely absorbs water and really shouldn’t sit for more than 2-3 weeks. If I have to travel I always go back to gasoline while the car sits. As far as power increase, naturally aspirated most cars can get 15-20 hp out of ethanol if they are higher compression, but boosted cars it’s significant, my Audi and cobra both picked up about 200 hp over 91 octane with the additional boost/timing and cooling ability of e85.I should get more hp due to more aggressive tuning since it would be harder to get premature detonations, not a lot but 5-10% more hp, but 1/3 less mpg. I can really crank up the tune and it runs a bit cooler. Which is why I’m only interested when e85 is 2/3 the price of 91. Well, I’m interested all the time, stil haven’t pulled the trigger. I just hate e85s hygroscopic properties and I let that car sit a bit, which doesn’t work well with e85.
id take 300 hp over awd in a brz