sigh ... here we go again


does premium give better milage .... NO (noted exception of if your local station selles premium without any ethanol at all, which will give a boost to milage)

does premium make your truck "run better" ..... NO

Can the new ford engines adjust themselves to take advantage of premium .... NO! (don't you think if they could ford would recommend premium and say OHHH look how much more milage out trucks get!)

Can knock sensors adjust for bad gas ... YES .... what they CAN'T do is increase your compression to take advantage of premium gas!

Can the ecoboost see gains from premium ... NO ... not only is it's compression ratio not high enough, but it's direct injected, and therefor the fuel is injected just before spark and HARDLY COMPRESSED AT ALL!


I'm not going to re-write the long explanation as to why, but if you are interested read this thread.
https://www.f150forum.com/f118/87-89-93-oh-my-312275/

 

I agree, my only statement(made of other post) is IF their is a gain it would only be under max load, wide open throttle. How much of the time can you be in that condition?

 

All I know is that the dyno charts for those of us that are/will be using a tuner show big gains using the higher octane fuel, this is not only at peak power but across the entire rpm range. I know this not just about the octane level but the tuners apparently need the higher octane to get the extra hp/tq.

 

If I am towing I use high octane normally driving is 87. Never had a problem with 87 until I was towing. Put the money you save using 87 into your pocket.

 

I would never run regular gas in a forced induction engine...Ford may say different, but no way would I.

 

I know right? What do the dimwits who design the thing, warranty the thing and everything on the line know about it?

 

sigh ... here we go again

 

indeed, though, even then you would have to be working the engine hard enough, on a hot enough day, to get the block hot enough that the combination of heat and compression was to much for 87 ... and really ... at that point you probably should have pulled over already.

 

I do get better mileage from midgrade (89 octane) than from 87 octane. I have a 2014 Screw Lariat with 5.0

 

You can most certainly run higher boost pressures with higher octane gas. What do you mean by the compression ratio isnt high enough? Forced induction absolutley increases cylinder pressures yes? I would never run low ictane in a boosted motor. Nothing like running 18psi and getting detonation. Does a lot of good for you motor :roll: