08 civic vti gets any benefits from premium 98 unleaded

**jazznewbie** · 06-09-2011 10:28 PM

hi everyone,

I am thinking about filling the civic with 98 premium fuel such as bp utlimate or shell v power, etc. Is it worth spending a few extra dollars ? Does it actually make any difference or I should just stick with normal unleaded ?

Thanks

**Stevil** · 07-09-2011 07:40 AM

Jazznewbie been quite a few tests that showed 98 and 95 premium gives you 5% more kms than 91 unlead and at least 10-15% more than the ethanol crap. Round my way if 95 is within 10cents of 91 I will use it every time. If 98 is within 5 cents of 95 then I upgrade to. I know it sound a bit weird but my FD1 gets over 700km out of a tank so I must be doing something write. Cheers

**johnnyluu** · 07-09-2011 11:18 AM

plus it's better for your engine since there's less pollutants and residuals from higher octane
Be a man. dont be a cheapskate on a car that deserves much more

**curtis265** · 10-09-2011 07:50 PM

I found no difference whatsoever in a civic. It's more important to use expensive oil rather than expensive fuel...Just don't use 91.

my 2c.

are you familar with the actaual difference between the fuels??

**jazznewbie** · 15-09-2011 09:12 AM

Originally Posted by Stevil

I know it sound a bit weird but my FD1 gets over 700km out of a tank so I must be doing something write. Cheers

wow.. 700km, that's impressive. Just curious, how much reserve is in the tank when the yellow light comes on.

**Stevil** · 15-09-2011 09:35 AM

Mate it varies with the yellow light. I have had it come on with 2 bars left and 10kms later there are no bars. I have found that when the last bar has disappeared it generaly has 1-1.5 litres left. The light coming on might mean 60kms or as little 20km left, either way its smart to fill. Had a good run early this week out west, filled up and drove 412km then filled up again as the guage was just beneath half. Took just over 24 litres of 98 which works out at 5.8l/100km. Car had just done 20K and was set at 100km with cruise control.

**kiwitrains** · 23-09-2011 05:32 PM

The engine is designed and manufactured to run on 91 octane fuel putting any higher octane fuel in will make no difference and in fact can have a depretmental effect on the valves as the fuel can burn at a higher temperature could reduce the life of the valves and seats. In other words mate you are wasting your money.

**CitizenErased** · 23-09-2011 07:01 PM

Originally Posted by kiwitrains

The engine is designed and manufactured to run on 91 octane fuel putting any higher octane fuel in will make no difference and in fact can have a depretmental effect on the valves as the fuel can burn at a higher temperature could reduce the life of the valves and seats. In other words mate you are wasting your money.

If this is true, I've wasted a lot of money for no apparent reason..

**Stevil** · 24-09-2011 01:28 AM

Kiwitrains thats a big statement ! Got any evidence to back up your claim ? remember we are taliking about a modern motor here.

**kiwitrains** · 24-09-2011 06:31 AM

Hi Stevil, it is not a big statement only what most manufactures state in there handbook that whatever octane fuel the engine is designed for it is a waste of time increasing that octane it also applies to additives for oil etc. they also state that additives can be detrimental to the engine now if you believe the manufacturer all well and good but I know from experience some people do not for some reason.

**Stevil** · 24-09-2011 07:14 AM

Kiwitrain hey I'm prob wrong but I understood the Ecu was designed to adjusted itself to take advantage of the high RON ie 95 and 98 fuel and 91 is the minimum ?.

Now I've only done 20K in my FD1, but I def get more K's when I use 95 and 98 and acceleration is def better, I rarely if ever put 91 in. Just recently after having almost run a tank of 98 dry I put some 91 in and almost immediately when I got back to a hotel (very short distance ) I could hear my engine knocking ! next day I kept Revs to a minimum and knocking later disappear ! so either my car adjusted timing or I need to smoke some more crack ?

**kiwitrains** · 24-09-2011 09:57 AM

Stevill you are correct the ECU does compensate for higher octane fuel but the argument is does it have any adavantages, you seem to so good luck, the following statement is from a recent Ford handbook `Higher octane fuels may be used without detriment but offer no significant advantage` also on oils `Do not use supplement oil additives or other engine treatments. They are unnecessary and could,under certain conditions, lead to engine damage which is not covered bt warranty.

Knocking on your engine, it should not do that even putting the 91 the ecu would act immediatly, crack well that is up to you !!