Since the 5.0 can run on regular or premium gas, what are you all using? Let me guess - 9 out of 10 use premium.
Higher octane does not keep an engine cleaner... it just burns at a higher temperature.It is much better to run 93 because it keeps your engine much cleaner inside and also it makes my 5/0 run like a swiss watch.
On the 10 the 91 octane gives you an extra bit of tq to 335ft/lbs and no official horsepower rating (although one can assume if it bumps the tq up by 10 pts then the HP should be around 325 on 91). There is no performance increase going to 93oct.I had a 2010, and I noticed no difference on the butt dyno when going from 87 to 93 octane.
However, with the 2011, I noticed a significant difference -- well worth the price to put 93 octane in there.
It wont cause any engine damage if you are running the stock tune. The stock tune is designed to run 87octaine, its just that you are not getting the "advertised" tq and HP numbers if you run the 87.Does anyone run 87 consistently? I will eventually run 91 but with my current drive 87 is sometimes a better choice.
Even though Ford claims you can run 87, does anyone believe it may cause engine damage?
By the way I'm purchasing a 2011 5.0 MT with 3.73
You'll get all kinds of funny smells until it's broken in. Mine has 700 miles on it, and it still smells funny, especially after running it hard. I get the rotten eggs now and again, and I always run 93 octane.I think 87 is making my Cats and Exhaust smell like rotten eggs....I just started to notice it. Do you think that is what its from? Or is there somthing else on the horizon. Also, when I picked it up from the dealer it had a top end ticking noise. I think they hot rodded it to hard or something. I am taking it to the dealer on Wed to see if its a lifter or a noisy injector. What do you guys think?
Ditto here. The hesitation only happens every now and then at low RPN's. I'm going to try 91 octane next time I fuel up to see if it makes a difference.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.