Does the 6.2 in a 2014 f150 need premium fuel or can they run ok on regular?
And what real!!! mpg will I get 3:55 rear end 2 wheel drive.
Thanks looking real hard at one now

 

I've never put anything but reg (87 Octane), in mine, even when towing our trailer and never had a problem. If there's nothing wrong with the engine, and it's not re-tuned for the higher octane your just wasting your money IMHO. I have a 4X4 with 3:73 gears, so my mileage would be a little worse than a 2WD with 3:55's, but I'll give it to you anyway. 13 overall average, 16 HWY, and 8-10 towing 7500 lbs.

 

The only reason I have heard to run premium fuel here in No. CA is that premium does not contain ethanol, and 87 may.

 

This is what Ford says about Fuel economy, F150 2014 :


F-150 Specifications
Highlights
horsespower: 411 @ 5500 rpm (6.2L V8)*
torque: 434 @ 4500 rpm (6.2L V8)*
Fuel Economy and Engine Highlights
Engine Type 6/2L
13/18/15 (4x2) 12/16/13 (4x4) 11/16/13 (Raptor 4x4)
(city/hiway/combined

*Using 93-octane fuel.
(got this info from: 2014 Ford F-150 | View Full Specification Library | Ford.com

Does this indicate you must use 93 octane ?
What does the owners manual say ?
I got a new F350 on order with the 6.2L .. I hope I don't have to use 93 octane..!

 

The 6.2 in SuperDutys is tuned at 385/405, which is lower than the raptor/150. This is for longevity while working hard. Some will say you will get benefit from higher octane, but without a re-tune, I have my doubts. No, yo do not have to use premium in your 350.

 

OK.. that sounds good to me.. I shall not worry then..!! thx

 

I'm thinking that it will run on 87 but to get the max HP you would need 93, on my F350 I was running high altitude 85 fuel out west and took a wrong turn and ended up at 700 ft, it ran fine but it did have reduced power until we filled with 87 and went back up into the mountains. With all the knock sensors I think it will adjust to about any octane.

Denny

 

11.58 mpg avg with 3.73 gears on my 2011 350 cc sb. Trying to see how low I can get it. Idles about 30 minutes a day in the winter. Trying to see if I can't get my mileage to the same as the triaxle crane i used to run. 1.5mpg uphill downhill fully loaded or empty at least I knew how far I was gonna make it .

 

That's interesting for sure Denny. So you're saying even though the 6.2 doesn't NEED 93 octane, it will adjust and actually benefit from it? Cause if it's a significant improvement, I don't mind paying for it. I ran a 91 octane tune in my '03 F150 for ten years, and loved it. I have decided to run this one stock though, at least until the warranty is up.

 

I don't know if running the stock tune that 91 would make any difference but with a tune it may. But I also look at it this way, years back any motor that had over 8 to 1 compression would ping on 87 but the 6.2 has 9.8 to 1 so maybe it well run better on 91, the computer may advance the timing giving a little more power, I may try it one day when I'm pulling. Things have really changed from the day when I built motors for my trucks, I would always have a problem with the timing after I shaved the heads and increased the compression just a little.

Denny

 

The owners manual for 2015 has 87 octane as the minimum, but suggests higher octane at altitudes may be needed.

 

The higher the altitude the lower octane needed, sea level requires more octane, it's all about oxygen content.

Denny

 

I'm a good listener but a lousy reader. I checked again and the manual said to avoid fuel less that 87 octane which is sometimes AVAILABLE in high altitude areas. Thanks for the correction. It seems like good advice when traveling to check the pump octane rating.

 

I've used 85 in the mountains for years but you have to be careful so when you drop down in altitude there isn't much left in the tank.

Denny

 

I run 87 in my 6.2 F-150 and get the EPA rated numbers without issue. I've run 90 for a few tanks and noticed no real difference in power or mpg.