What octane gas do you guys recommend I use for my ep3? I know, preferably 91, but is it necessary that I use it - or is regular fine?

 

i use w/e the manual says

 

You run a "semi-high compression" engine. Anytime you go down in octane, you run the risk of pre-detonation and pinging.

Just use what the manual reccommends. Honda knows their own cars like nobody else, so do what they reccommend.

 

If i recall my ep3 was regular.

The type s i believe was 91+ recommended, however usually once a month i'd get down to NO gas and fill up with super just to "clean out the excess".

Consider yourself lucky.. my last 2 cars require super

 

i think ur supposed to use 91+ octane with i-VTEC. but it should tell u which rating u need rite on the inside of ur gas door or cap.

 

You can temporarily use a lower octain than what your engine requires. The ECU should retard the timing when it detects pinging. Your performance and mileage will suffer, though.

Just use the correct octain your engine requires. Like others have said, it should be indicated on the filler door.

 

91 octane is what 20 cents higher a gallon than regular? rsx has roughly a 12-13 gallon tank? Worst case scenerio you spend 2 or 3 more bucks to use premium. woopty doooooo

use what the manual says

 

Use the correct octane fuel according to what your compression ratio is to prevent knock.

Basic Rule! 9.0:1 and above you better use 90+ octane

or I could go **** and do a whole write up on hp output & compression ratio & what octane that's needed & what you can do to help prevent knock like water injection etc....