My partial point on fuel and other additives is that .
You may feel a difference in power using 91 , however , there may be no real difference , just the expected one .
There's a reason there are soo many additives available , there are soo many people who see or feel the difference ...
I have an 2008 and a 2013 , 87 in both tanks , .
Got a buddy who worked for Toyota for 25 years as a mechanic , says 87 no problem .
I am not a fan of additives , emotional purchases says another mechanic friend :)