I know 91 is recommended. who is getting away with running 85, 87 or 89 and what results are you getting? Noticing any problems?

Cary

 

please don't be cheap when it comes to the s2000. you can cause serious damage if you run lower octane gas, like detonation and pinging.

 

Why do that to the car? I am sure you can get away (not fully) with using lower grade gas, but don't. Do what is recommended, i doubt that honda engineers put a premium sticker there just to look cool. If you want to use lower grade gas, get a miata.

 

Your ecu will adjust and it's okay, but I noticed a difference when I did it for a couple of tanks. The car felt sluggish.

 

ALL IM GONNA PUT IS 91 or higher...

gotta feed her good food is you want her to perform like a vtec machine

 

Would vtec enage with lower grade gas?

 

I never go 87

 

I put 87 in one time cause they didnt have anything else and I needed gas badly. Vtec still engages but the car definately feels a bit slower.

 

Don't be so cheap!
I figure if you are saving even 20 cents per gallon, you are actually driving for only 1 cent per mile less, if your car is averaging about 20 mpg. If you saved 10 cents per gallon that works out to 1/2 cent per mile your saving! Put in at least 91, your car will thank you.

 

Hi:
Why is this complicated? Put 91 in, or the nearest higher octane rated gas. My guess is that the ECU retards things enough you wouldn't get pinging, but buying a car with one of the highest compression rates out there, and then throwing 85 octane gas in it is like buying Caviar and serving it with a $3 bottle of sparkling wine.
-s