[Z06] Is everyone using 91 Octane?
Burning Brakes
Joined: Jun 2004
Posts: 1,083
Likes: 0
From: I'm not quite middle aged and I only own one gold chain! San Jose CA
91 octane is the maximum octane available for those of us in CA. We used to have 92 or 93 available to us but a few years ago they limited us to 91 octane. The car does run okay on it, but following a recent dyno run, the tuner told me that he could get some significant hp gains out of my car by tuning it for 91 octane. He said that the factory tune is maximized for 93 and that my car was knocking quite a bit with the 91. All that being said, I still pulled 360 at the rear wheels on a bone stock motor.
As of today, the best I can find at a major brand station is 3.20 per gal. That is a Union 76 station, but there are stations in the area selling 91 at 3.30 to 3.50 per gal.
As of today, the best I can find at a major brand station is 3.20 per gal. That is a Union 76 station, but there are stations in the area selling 91 at 3.30 to 3.50 per gal.
Melting Slicks
Joined: Dec 2003
Posts: 2,340
Likes: 722
From: Chicago N/W Suburbs
I own a stock 2001 convertible with automatic. I just cruise around town. No performance driving. I always used premium 91 octane here in the Chicago area.
I'm now experimenting with 87 octane due to cost of fuel. So far, with half a tank consumed, all seems perfectly normal. No pings, no issues. Gas mileage is being watched closely.
It's way too early to conclude, but preliminary fuel economy results is....... 1/2 mile per gallon less with 87 octane.
Final results may be "A Wash" The money I'm saving in cheaper gas might be lost in lower fuel economy.
On the other hand, if the fuel economy ends up the same, then 87 regular is a good choice for cruising/commuting.
I'm now experimenting with 87 octane due to cost of fuel. So far, with half a tank consumed, all seems perfectly normal. No pings, no issues. Gas mileage is being watched closely.
It's way too early to conclude, but preliminary fuel economy results is....... 1/2 mile per gallon less with 87 octane.
Final results may be "A Wash" The money I'm saving in cheaper gas might be lost in lower fuel economy.
On the other hand, if the fuel economy ends up the same, then 87 regular is a good choice for cruising/commuting.
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