Originally posted by evolution
The manual suggested 87, but today the pump would only spurt out 94 and I was in a hurry so I had to get it.
I dunno, but the car felt a lot smoother. 
I've seen dynos that prove 87 is the best, but my ass dyno says otherwise.
haha whatt? you've seen dyno's that prove 87 is the best? here look at this and tell me if you think the same....
"Can I Save Money and Run Low Octane? Wrong!
Here is a dyno chart showing two different cars. When I dynoed one of these cars, I knew that something was immediately wrong! Guess which one?
Notice that the 89 Octane car's power curves are very jagged. This is a result of the car "hearing" knocking and pinging and desperately trying to adjust the timing and save the engine. The ECU is almost searching for the best advance and having quite some trouble, not good.
The stunning results of running the lower grade fuel are -22 ft/lbs and almost -19 HP!!!! Ouch!
Folks, don't abuse the knock sensing capabilities of you beloved car. Let's just stick to the good stuff! "
some cars run fine with 87 but better and smoother with higher octane, you wont feel anything goin from 87 to 91..but i think from 87 to 94 yes you will...and some higher compression ones like the vtec engines require 91 octane. hope this helps.