cobraguy69 Posted November 2, 2017 Report Share Posted November 2, 2017 Just got mine ! A gorgeous 2016 Mustang Shelby Hertz. . The first thing I had to do was put some gas in it, so I looked in the owners manual and it said for the 5.0 engine to use 87. I called the previous owner ( it was a licensee car - never rented ) and he said he always used 93 " to avoid the ethanol ". Where I live all grades of gas have ethanol , and in fact, to my knowledge ethanol is added as an inexpensive way to boost octane rating, so I am asking you owners of this car, or any Mustang GT- What do you use, and have you found it makes a difference either way. I am thinking I should do what Ford says - 87. Quote Link to comment Share on other sites More sharing options...
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