Hey guys I'm new to the forum and I apologize for such a dumb question but I have been confused by a number of sources and need a true answer to the question of what octane fuel should I run on a 97-01 prelude? I can afford 89 octane but I'm not sure whether I can get away with 91. What is the actual fuel requirement for this motor stock?

 

Pretty much all Honda's say to run Premium only.(91-93)
With the H22a4, it's right around 10:1... so you could probably get away with 89.
Run 89 and see if it pings at all. If it does run 91. If it's real cold where you are 89 may work. An H22a needs 91-93 octane with stock ecu tuning.

 

I live in BC so its pretty cold all year. Does this have to do with the amount of air taken in because coldness increases density? But thanks for the advice

 

Heat causes detonation.(That's where the fuel ignites before the spark occurs because of heat and pressure). Detonation is bad. I'd still just run premium.

 

Alright thanks, I'll fill a quarter of my tank on mid grade and see how it goes.

 

How much is premium up there? For 92 it's right around $4.00 here.

 

Stock H22 requires Premium fuel 91 or it will ping

 

h22a1 in 94 prelude here. gas cap specifically says premium fuel only. i wouldnt put anything less

 

In Central Illinois - Shell Vpower 93oct, and BP (Amoco) Ultimate 93 oct is $3.699

 

No fair. Does anyone know why different states have different octane fuel? You guys have 93, we only have 92 and we pay more.

 

Here we have 87, 89, and 91, i havent seen 95 in a long time but apperently we have it, reg is 1.20 ish, mid grade is 1.34 and premium is 1.40. Keep in mind this is per litre so ill give the per gallon when i do calculations

 

mid grade 4.47 per gallon... shitt according to an online calculator

 

h22a4 required 91 or higher octane.