X2!!

Please tell me you're not putting in 87!

still 2.55 for 87 here

That'* why there is a sticker inside the fuel door...........

"Premium Unleaded Fuel Only"

Wait, there isn't really a sticker that says that is there?

It'* a given that I use 93 always,so it'* force of habit

I had to go out and check

i wonder what my car would do if i threw 93 into it...i bet it would be in euphoria

You might see a slight improvement in fuel mileage going to mid-grade, but there is no extra power in higher octane. It'* actually HARDER to ignite. We use it to prevent pre-ignition (detonation or knock) from the heat of the boost charge combined with compression. In other words, we HAVE to. You don't, and it won't benefit you.

Some members here have sworn by a slight improvement by running mid-grade (89 octane) in a non-supercharged car. If it'* in your budget, a test could be done on your own car.

hah, been there done that. Doesn't seem to have much effect... I ran my car on ONLY Shell Premium 93 octane from about...Jan 06 - June 06...no effect whatsoever...and i was going broke...fast.

But umm, hah, why in the hell are you only getting 13 mpg? you should see me! I do about 100 on the freeway almost daily (always within normal limits of caution i.e. no other cars etc)...and do HARD city driving and the worst i get is about...say...18-19 avg tank? and when i'm nice to it i get about 26 avg

My car is also 100% tuned up...maybe you should look into that :P

Check...

Plugs
Wires
Oxygen Sensor
Air Filter
Use Mobil One Syn Oil
Catalytic Converter
And run through some fuel system cleaner...

otherwise you have just magically figured out a way to use more gas than i do!!!

But hey...umm...when you run your gauge all the way down to empty..what is the most you have been able to put in? My record fill would be 15.8 gallons...i thought we had 18 gallon tanks!!!

Personally I have tested this with my engine. using 87, then 89, then 93 from both Shell & BP just to make sure it was accurate, I had a scantool hooked up and everything recorded just about the same.

KR & SA etc seemed to be the same, thats when I switched back to regular.

(slight differences were: few points of KR with regular under HARD throttle, none with upper grades, so that would sort of confirm about people liking plus/midgrade better than regular.)

I've put 17.1 gallons in my 94... Yea just about every turn i made at that point my car would start to stall...


But i have a new fuel pump now with its own problems :goes to start a new topic: