A while back, in a thread about the 6.2L engine, it was mentioned that while the engine is rated at 385HP on reg. unleaded gas, using 91 octane or better would net more power (10HP, +/-).
I was wondering if the computer for the 5.0L engine is set up the same way. Just wondering.....

 

Almost all motors from OBDII on perform better with higher octane fuels. My Heep gets 2 more MPG on the highway with 91 Octane.

To specifically answer your question, yes it will. In fact, Ford has released two HP figures for the 5.0, one for 85/87 octane and one for 91/92 octane.

2011 Ford Mustang | View Full Engine Specifications | FordVehicles.com

2011 Ford F-150 | View Full Engine Specifications | FordVehicles.com

I'm aware the 5.0 for the trucks is a different motor than the Mustang version.

 

Thank you, Matts72, for the info! I checked both links, and see that the mustang specs gives figures both ways, but the truck specs don't. It might be a safe assumption that it works in both cases , though, like you found out with your Heep. Thanks again!
Gary

 

On the f 150 5.0 it gets better power on E-85 but will getless mileage that is the figures I have seen but can't rememberr where I saw it.

 

Hey Jr.Ranger, you might have gotten those figures from the 2010 F150 brochure where they list the engines. The 5.4L is listed for gasoline and E85 versions, and the E85 version is good for 10HP and 25#/ft. torque over the gas version. Like you said, this comes at a mileage cost because of the lower energy content of E85. The added power comes because of the higher octane, enabling more advance. My question is whether the higher octane of 91 octane gas would let the engine make more power AND better mileage from the added advance. Straight gas has no tradeoff, E85 does with its lower energy content. Besides, I'm in California where E85 is almost non-existent.

 

I'm wondering where you even get E-85, I've never seen it in my journeys across the country. We don't even have E10 here, or Biodiesel since they aren't UL tested and the State requires UL testing for all on highway vehicles.

E85 is a total gimmick anyway, lower economy, it takes over a gallon of petroleum gas to produce per gallon, and it robs food from millions of American tables. I guess it makes the greenies feel better about themselves.

 

Those numbers are for superduty.

Advertised F150 6.2 #s are on regular fuel as per Fords media release.

 

Yea, looks like you only have a couple of stations in the whole state. Not so many in Arizona either. But after running a couple of tanks, I like it. To expensive to run all of the time here, but you can sure feel the extra power, and the exhaust even sounds different. The hot rodders are buying it up now. Works good in a high compression engine, and cheaper than racing gas. Just wish it were cheaper.

 

No argument there- It was mentioned that the Super Duty 6.2, when it is run on 91 octane gas, power is increased 9 or 10 horsepower.

My question was whether or not the 5.0 in the F-150 would react in the same way, the knock sensor allowing more spark advance when using high octane (91 or so) gas. Maybe I wasn't too clear in my intent. Not the first time!

 

I've read it gives you a very nice bump with the 'stang 5.0L, so I'd assume you'd get something on the truck.