doctorschlachter

I hope you are trying to make a joke lol. Premium fuel will not give you any extra power. You need premium to reduce pre detonation and knock among a few other things. You do not gain any power from it.

RobertP

Yes u do gain power on premium, u have no clue what u are talking about take the 15 expedition for example there 365 hp 420tqvand the navigator is 380 hp 460tq, I've verified with my ford guy they have the same engine same computer they are fully adaptive and measure the burn time at the plug, it's no different than the sho Taurus there 365 hp 350 tq on premium less on regular fuel, older vehicles were only tuned on either regular or premium, they would not adjust, I'm not joking I work on cars for a living

BOSSMAN2888

Are you making a joke? Premium fuel will give you more power in an Ecoboost and they are adaptive to the fuel. What are you basing no power on butt dyno? Do you not believe actual dyno #'s, info from engineers and dyno tuner/operators, or don't want to read what experts say?

130428

based on what we all see at dealerships day in and day out, that's not always a good reference... bwahhahah!!

(you may resume your arguing now)

RobertP

I have my own repair shop way above dealer ship work we do quality not quantity

Uberbob102000

Now I'm pretty much neutral on this at the moment because I don't know one way or the other but I can't seem to find ANY stock tune 87 vs 91/93 octane dyno graphs. The bit about the engineers and dyno tuners doesn't matter to me because AFAIK, the engineers at Ford haven't made any sort of statement on 87 vs 91 power in the 3.5L and someone saying things is just that.

If you have that, show it and stop the all this arguing.

BlackBoost

If you want to race, don't be cheap and just buy premium fuel, go start modding and tuning your engine to the point where it NEEDS premium. The engine is tuned for regular grade fuel, period. It will only need higher if you tune it, end of story. It also has no effect on mileage and can actually be worse because of the "old fuel" problem. I've gone through several tanks of both, no difference.

Like the OP said, STOCK ecoboost, which makes any arguing worthless. But go ahead and argue, you're just wasting your breath/keyboard.

Uberbob102000

Thank you. Arguing is totally pointless and get us nowhere. Data >>>> talking

If you want/can dyno a stock 87 vs 91/93 and find you get more power, put the data up there to be scrutinized and repeated by others. Anything else is just idle speculation.

RobertP

Please go look at the 15 or 16 navigator there numbers have a astrieks beside stating those power numbers are on premium and same as our trucks on regular ford has done this on the sho Taurus the 6.2 in the f150 is 412 or premium vs 400 on regular

130428

^ except that it says nothing like that about the F150, or does it?

since Ford, BMW, Porsche, Audi and others can rate the "same" engine anywhere from say 150 to 250hp without any mods other than tuning, it can be argued that Ford didn't "tune in the extra premium power" for the F150, or they would be the first to brag about it, no?

back in the days, Audi's 1.8T was rated at 150, 180 and 210 hp in different models (base, S, RS or whatever they were) while exactly identical across the line-up.