Ok first off, I know to use premium. The car has not had a single tank of anything but premium since I bought it. For some reason the other night I decided that I would try a tank of mid grade(quite a bit cheaper) and just drive like a grandma. I am so sick of paying $1.85/gallon for gas around here, and money was getting a little tight. Anyhoo, on to what happened-

I had been driving like a grandma I decided to punch it once from a roll on the interstate. It felt good at mid range RPMs, but at about 5k she started pinging REAL bad. I looked behind me as soon as it started pinging and there was a big cloud of smoke behind me, lol. I guess when the knock sensor picked up some detonation it richened up the fuel and retarded the spark some. The car fell flat on it's face!!! I may go buy some octane boost tomorow

John

 

thats interesting...i've used 89 a few times since premium (91) down here is running well over 2 bucks my car is all stock and i didnt really notice a difference

 

I had pretty much the same results with mine once when I accidently put in some mid grade fuel. As far as gas prices go, $1.85 isn't that bad, its $1.79 for regular here, and premium right now is $1.97!

Aaron

 

Tried some 87 before. Couldn't even go up the slightest hills or accelerate too fast or my engine would ping really bad.

 

Wow... That must be nice

It's rounding $2.10 here for premium last time I drove past the station saturday.

I'll still stick with the premium though, although I guess the increased price and increased mpg all about even it out -- who knows though till ya try it!

 

I feel real bad for you guys that have to pay $2+ dollars per gallon for gas!!!!

Oh well, I guess I know the limits of mid grade gas now

 

Here's my receipt from last nights fillup.

12.671 gallons for $28.88

That is... $2.279 a gallon... **** YOU VERY MUCH CALIFORNIA AND GOVERNOR GRAY DAVIS.

 

Ouch, that sucks!!! Give him a big **** you from me too

 

Use mid-grade all the time in the Z, and never have a problem with pinging or anything.....seems to work just fine.....


Have run at the track with 91 and 89 and had no difference in results...

 

Premium (91 cat-pee octane) is around $2.29 where I live, be glad you are paying under 2 bucks

 

Premium (93 octane) is $1.799 here in Houston

 

I Run regular ever so often and it runs fine on it regular is sooo much cheaper than premium regular runs around 1.57 down here and 1.80 fer premium

 

Ive used 89 a few times when the car was still stock, never had any problems, but then again, I rarely went WOT with it. I've lucked out on gas since we own a farm and buy 93 in bulk for all the vehicles and equipment

 

And I though it was bad here....

I just saw Premium yesterday for 2.17/Per Gal.

and how the hell did Grey Davis get re-elected....all these damned illegals....that's how!

 

When my buddy bought his car the dealership used 87 octane in it all the time.

Seemed a tad slow.

After a few tanks of premium we Gteched it and it seemed normal.

Lower grade gas should just retard your timing no?