[06MustangGT[WB]]

I purchased a "relatively new" 2006 Mustang GT with 1,998 miles on the odometer. This car is fantastic. I really missed the 300hp after driving Japanese for the last 25+ years (although my 255hp 2005 Nissan Altima SE is a pretty close 2nd...).

Enough of the commercial...

(Having not first consulting the owners manual snuggled securely in the glovebox...) I decided to try Chevron Supreme gasoline on the car's first fill-up, figuring that this would be a good thing...

MAN! How much top end noise can this car make? I understand that the intake manafold is bare to the world's ears since Ford decided to delete the manafold cover from the 2006 model, but I would have never thought in a minute that using 92 Octane gasoline would result in such noise. The car sounded like a diesel truck!

After reading the owners manual which states in no-uncertain-terms that 87 octane is the "REQUIRED" fuel, I topped off with 1/4 tank of REGULAR (87 octane) and within a few driving miles the unacceptable engine noise (what I would call VALVE clatter or SPARK knock, if these old terms still apply) subsided and the throughty growl of the Mustang reappeared.

Has anyone else experienced this and wish to comment, or does anyone have any mechanical advise or infomation to share?

P.S.

I posted some sounds. Originally recorded in WAV format by my mp3 player and then converted to MP3 on my webspace at URL http://members.cox.net/ftp_server/MustangAudio for those of you who are interesed in this type of thing.

Be aware that I converted them from LOSSLESS *.WAV format to 192/bps MP3 and the "EXHAUST and INTERIOR" is "lacking" in it's representation. I plan to reconvert using a higher BPS for the MP3 when time permits.

[stlwagon]

Welcome aboard! That's a first for me. Running higher octane fuel without a tune should have no adverse impact.

[duckbubbles]

I've run all three grades of fuel in mine, just to experiment, and haven't noticed much difference in performance, or any engine noise. I might be imagining, but I think it gets a little better mileage on mid-grade.

Frank

[06MustangGT[WB]]

Indeed, I seem to be getting +1 MPG using regular... Very perplexing. I did speak to a service writer at CARMAX and he advised that since the pony was still under factory warranty I should run it by the Ford Service department if I can recreate the symptom...

[bigbensbadstang]

i have a 2006 gt 10k miles mine runs much better on prem.the only thing with my 06 is lots of road noise coming from passanger side unless on perfectly smooth roads

[stlwagon]

Originally Posted by bigbensbadstang

i have a 2006 gt 10k miles mine runs much better on prem.the only thing with my 06 is lots of road noise coming from passanger side unless on perfectly smooth roads

Is it tuned for premium?

[bigbensbadstang]

no i have not bought a tuner yet.that is next i know they say with out a tune for running premum is wast of money but it seems to run better to me.

[Taxpayer]

That's too bad that your car is noisy. I run 87 in mine and it is just as quiet as can be. No complaints.

[Mister Roper]

I just listened to a couple of your MP3s, that's the injectors making that sound.