So then what's this deal I hear Ford engineers proclaim that using premium raises the torque band in the low-mid RPM range?

"Best of all, both engines will be able to run on regular unleaded just fine. According to powertrain supervisor Chris Roxin, "The 2010 Mustang runs great on regular fuel, and that is where we quote our peak numbers, but we also have a great dual-adaptive knock calibration that allows the 2010 Mustang to run on regular fuel as well as premium fuel, and the system figures it out itself." He added that premium fuel can improve the torque of the engine in the low- to mid-rpm range."
source (bottom of the page)

That being said, is that another difference from the 2010's 4.6L to that of the 05-09? the "dual-adaptive knock calibration"?? I would think so? But aren't too sure.

 

I was told in 05 when I bought that one that the engine would also adjust itself to the fuel, and with my 07 it almost seems that if I run say 93% alls good , then I run it right down I the lowest no tune nothing it knocked some, so I stopped right away dicsonnected the battery and hooked it back up , then the knocking seemed to Go Away ? not sure if it actually readusted or what but I mostly run highest I can, far less ping/knock etc,

 

I have a 2010 and have run 87 and 93 and do not notice any real difference between them but the car seems to get better mileage on 87. I run the same route to work every day.

I use BP (as Ford suggests) and Sunoco. I have taken some long trips and have had to use other brands and with the exception of Shell I can tell the difference in how the car runs on the other fuels.

I have also been told by the local guys here in Hampton Roads VA (DTP tuning) that they prefer you use BP as it seems to be the most consistent gas and they can tell when tuning a vehicle and doing dyno runs.

 

I get about the same mpg's with my 93 tune as I do with 87 and no tune. The 93 and tune make the car more fun to drive tho.

 

We've used "BP" exclusively if it is available. Remember reading a couple of years ago on this TMS site, about "BP's" additives helping prevent some sort of sulfating in the Mustang's fuel system and the engine's fuel injectors. Which I believe is why FoMoCo recommended it? Anyone else remember that info? Also when we put in a tank of "BP" Hi-test, there is a real kick in the butt-o-meter, during launching and also when pulling through the lower power range. Not scientific mind you. Just the "G's" feel and engine sound.

For the Mustang's fuel system (cleaning) maintainance, we use the "Sea Foam" brand additive a couple of times a year in the tank. Also when doing the winter storage thing too. P.S. For years it has purred like a kitty and still runs very hard for a stocker. CalStang

 

I use chevron 93 octane as i feel it leaves the least amount of gunk behind.

As far as switching fuels to remove the older fuels additives, it's a nice cheap alternative but if you truly want a clean motor and fuel system nothing beats the seafoam job once a year. Using this method you can "Seafoam" your car once and year and the crap that comes out the exhaust will tell you which gasoline is the cleanest as long as you only use that same brand during the year between "seafoams". Using this i have found chevron to leave the least behind. I also feel like chevron makes my car more responsive however that could be in my head.

As far as worrying about octane rating and detonation, the motors knock sensors should detect any detonation and adjust the timing accordingly which should reduce or eliminate engine knock however it doesn't replace the performance that a perfect tune/octane pairing will produce along with no knock.

Just some experiences i have learned from my dealings in this matter.

Info about seafoam

http://www.google.com/search?q=seafo...x=&startPage=1

I use the vacuum and gas tank methods once a year. It helps me sleep at night.

 

If I have a choice I use Shell 93 Octane. I'll use BP, Exxon, and Texaco as well if it's all that is around. I don't put the generic gas in.

 

72,800 miles on Shell 87 or BP 87. Here in Indiana these have No ethanol in them that I can tell. I have put in the cheap stuff (gas america speedway even marathon gas) a few times in the 5 years. The car runs sluggish and uses more fuel according to the average mpg readout and my calculations. I also like Chevron and Texaco if out of state and it seems to run good on these fuels. I just went on a 400 mile day trip Saturday and averaged 25.348 mpgs running 70-75 with about 20 miles being off the highway looking for lunch and gas. I currently have the Brenspeed 87 tune in it and Shell regular 87.

 

I totally agree and concur Glenn. My wife actually discovered this. One day (when Shell station was Texaco) we had been using generic "Raceway" gas and she filled up at Texaco. She says to me "hey, I notice a big difference in the way the car runs with Texaco." I initially called BS but then she dared me to try it so I did. At the time I had a '97 Cobra convertable and I noticed immediately what seemed like a 20+ horsepower difference. I haven't been back to generic "towelhead" gas since.

Shell FTW!!