CA Coyote

I'm a noobie to this forum and I just bought a '15 GT.


Perusing thru the owners' manual/OM, I found the "fuel section" illuminating. Much to my surprise, it stated to use no less than 87-octane fuel for this 5.0L engine. I always thought, high-perf. engines needed premium unleaded (91 RON octane in CA)?


Am I to read this way, the vehicle will run "OK" with 87-RON/octane but at slightly less performance than the 91-RON/octane (both in power and mileage)? 91-RON/octance is "recommended"?


Please advise and thanks (in advance) to all?
CA Coyote

Spork3245

Yes, you can use 87 octane in your GT. However, you will have reduced horse-power as the computer will change the fuel leaning. I believe 87 octane nets you around 405-415bHP however, 91+ octane puts you at the full 435.
Other than that, it will run fine with no pings or detonations or anything.

Csrt4to5.0gt

Congrats on the new mustang! Post pics if you could. You can safely run 87 octane, at the expense of a few horses. You will get a little over 400hp and 380tq on 87. The cars 435hp and 400tq is actually with 93 octane.

Csrt4to5.0gt

Here's my 2016 Comp Orange GT premium. Is yours an actual 50th?

CA Coyote

Yep. I really like your red, though.

CA Coyote

Orange, my bad.


My pic is not up-loading (for whatever reason?).