Ford Mustang Forum - View Single Post - What octane are you using in the GT?
View Single Post
post #7 of (permalink) Old 06-24-2010
S197 Member
whiteshelby49's Avatar
Joined: Apr 2008
Location: Panhandle
Posts: 91
Best stick with premium

You could try some 87 octane but with the automatic (that's what I have), I noticed a slight hesitation and power loss at low rpm. Like right off idle and at around 30-35 mph when it is lugging along at 1000 rpm. The intake drone inducer would cackle a bit as the throttle is pressed- slight hesitation and then it would accelerate. The outside temps were pretty high around 95-100 degrees.
Premium 93 cured these symptoms in less than 25 miles. My car was filled with 87 from the dealer new. I have only run premium since.
Guess maybe the timing and cams retard under these conditions with the 87. Car runs great with 93!!
whiteshelby49 is offline  
For the best viewing experience please update your browser to Google Chrome