mystrx8

Yeah, I know, 91 is recommended, but because of high gas prices, and the fact that the manual states that 89 octane can be used at reduced performance, I decided to give it a shot anyway, just to see. I am sure 91 octane (or rather 93 around here) might probably give better emissions, but you can't get much better than that.

BTW, 89 octane does give not only reduced performance, but lower gas mileage as well. I got about 16 MPG with city driving only.

khoney

Just filled up with 89, and gave it a hard run today - I see no degradation in performance - in fact, it felt quicker to me. Granted, it's just a butt dyno, and my butt has no cal sticker on it... but that was my impression.

mystrx8

I only stated the degradation in performance per the owner's manual, not my personal opinion. However, I have been keeping up with the gas mileage.

XUrotaryrocket

Rotaries have always liked good gas.

Do yourself a favor and DO NOT dick around with anything less than recommended octane levels - especially if you are going to run the car hard.

ZASKAR-RX8

(Excuse me for my bad english)
One question,

how much does it cost gas in USA? because it's said that in USA is very very cheap.

Thanks

BRealistic

Ahh, memphis has emission tests. I forgot that this is mainly based on population. In my area, we don't even have basic safety inspections. And believe me- we need them.


Ok, emissions.. You do realise that U.S. vehicles must pass emissions for 100k miles, right? I think that is why your new car is so 'clean', but wait and see how it tests at 50k miles and 100k miles. Anywho, this is the same problem the Miata owners were faced with- all Miatas were tuned to meet Cali emissions which dropped the hp. Were they able to regain the lost hp with ecu tweaks?

neofreak

iTrader: (1)

In CA, your car has to pass smog for thirty years, regardless of milage.

(pre 1973 cars are exempt)

khoney

Note to self:

Should have used premium fuel in my '87 TII for the past 17 years, instead of regular.

KyngNothing

it's between $1.50 and $2.50 per gallon of gasoline, depending on grade and location.

(1 gal ~4 l)

BRealistic

Oh sorry. I guess I should have mentioned that 100k mile emission comment was regarding what the engine must be able to endure and still pass emissions- I think they perform some type of test to detremine if under nornal wear and maintenance, that an engine will survive 100k miles and still pass emissions. Not 100k miles of driving by the owner.
On a related note, anything made after 95 has an 8yr/80k mile emission warranty on certian parts (cat, ECU, etc).

agisd

that's the case here

Buger

Hi Brealistic,

I believe 100,000 actually used to be the old standard for "full useful life". Check out the latest regs and the new Federal Tier II standards require the testing after 50,000 and 120,000 miles.

I posted some of this stuff and the current worldwide standards in:

https://www.rx8club.com/showthread.p...774#post103774

Brian

IGOZMZM

I have filled up twice with 88 octane here in UT and my MPG on my last tank was 21.9 . Granted that was mostly freeway driving, but it was also with the A/C on all the time. And MY butt dyno didn't notice a reduced performance, but I'm not sure how accurate my butt dyno really is :D

All I know is my MPG is getting better with the mileage (currently at about 2700 miles). Each fill up gets a little better.

ZASKAR-RX8

Uauhhh

that's great for you... it's between $0.39 and $0.66 per litre.

here in spain it costs between $1.2 and 1.6 per litre

you're lucky

mystrx8

WOW!! Now that's a lot of money for gas!

mystrx8

Where are you located?

Digisan

I agree, definitely not a hi-flo unit