Generally stating in any car, can I use 91 octane in a car that says to use 87? I know if you do the reverse you get knocking or pinging. Will using a higher than recommended octane hurt my engine at all? Or will it actually help it?

Cars in question:
2007 Toyota Camry
2008 Mitsubishi Lancer GTS
1998 Ford Explorer XLT

 

nope, shouldnt hurt it at all

 

I couldnt see why it would hurt it either... but for some reason whenever I used it in my Civic that called for87(Yes, the Civic I wrecked.) it tripped the CEL.

 

using higher than recommended or needed octane CAN cause problems, as well as **** away money.
do NOT use it unless called for.
period.

 

Makes sense to me.

 

...explains a lot.

 

all higher octane does burn faster i tried it on my tiburon V6 i lost mpg.plus it cost more.your car will run better on 87 oct unless you have a car that needs 91 oct

 

Higher octane doesn't burn faster, it burns slower, that's why turbo cars and high compression cars use it. It's to keep knock in check AKA pre-ignition.
http://www.bajajusa.com/High%20Octane.htm

You lost milage because your car spit out unburnt fuel out the tail pipe.

 

I think year1lazeris right! I tryed it too and I got the same results

 

but it has been proven by silver......