My biggest fear is the ethynol. I believe it damages hoses and rubber parts in the carb. Not sure if its fact or not.
Anything with around a 9:1 or less compression ratio should run fine on 87(can add almost a full point to that if the engine has aluminum heads)... The old method used when the owners manual were printed was a different system, so approx five points less than what's recommended is fine...
I haven't had any issues, and my car is daily driven. My car has an original gas tank that came from a '73 4 door that was used to deliver mail for most of it's life. That car had 316k miles when I got it from the original owner and used it for parts. The tank was spotless inside when I installed it on my car back in 2005. I have put almost 200k on my car since then, mostly on E10 87 octane gas which has been common around here since 2006. The tank still looks spotless and clean inside, no signs of corrosion. I bent up my own brand new fuel lines back in 2005 from 3/8" steel line from advance auto, and used a new piece for rubber line between it and the fuel pump in the engine bay at that time as well. I'm still running on that same steel line and same piece of rubber line in the engine bay to this day, been there through three different engines, and it's not showing any signs of degradation. The only carburetor issue I've ever had is from a pinhole developing in a brass float that was original to my carb, which came off a '62 Chevy... I'm not saying I agree with E10 being forced on us, or believe it's a good thing in any way. But I do believe all the hype about it degrading fuel system components is mostly just hysteria. I've seen no evidence of it on my personal vehicles.
Ethynol does not destroy rubber, it destroys metal. Such as your gas tank, fuel lines, pump, carb. That is why your vehicle must be built to use higher ethynol blends.
