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Be careful if you do. The 3.5EB likes premium... the difference is measurable, both on a dyno and via the butt-dyno, assuming you run a few tanks so the OAR can fully adjust. You may not want to go back to regular.
MPG gain is not real big. However it does run better on premium, and I see 1.5 mpg better on the interstate.
Originally Posted by lariatpsd
Ecoboost will run better on premium, anyone that says they won't is wrong. I have had 4 so far and that's all I run. The owners manual states it and even the raptor models advertised hp is on 93. All lincoln models clearly state to achieve the advertised hp numbers you must run premium. I guess it's all lies correct? Lol
The owners manual for my Ford F-150 3.5 EB recommends premium. My Grand Sport manual states Top Tier Premium. Our Range Rover owners manual states Premium. All five our our Harley's owners manuals state premium. My boat and lawn equipment are all we own that does not recommend premium.
There is no question that using Premium adds quite a bit of HP/TQ. Just look at 5Star's dyno chart posted on their web page for 15-16 3.5L Ecoboosts, specifically the Pink and Green lines.
"To provide improved performance, we recommend premium fuel for severe duty usage, such as trailer tow."
I found that my 2018 v8 knocks with regular gas (87 oct). it doesn't with 91 octane and I seem to be getting slightly better MPG.
I'll know for sure next month when I drive cross country with 3800 lb trailor. I'll test both in flat states (will definitely go premium for mountains).
I found that my 2018 v8 knocks with regular gas (87 oct). it doesn't with 91 octane and I seem to be getting slightly better MPG.
I'll know for sure next month when I drive cross country with 3800 lb trailor. I'll test both in flat states (will definitely go premium for mountains).
It will likely take more than a tank to get a good look. Most will run regular consistently and then run Premium for a tank and go back.
I run Premium all summer and the trucks runs smoother and seems to have more performance, especially towing. It just my opinion and YMMV. I have no doubt that for most uses Regular will not hurt the engine in the slightest.
You do need to run more than one tank for the computer to adjust fuel maps. I ran several tanks shortly after break-in which was a couple thousand km's, no difference. Did it again last year, no difference. I stick to regular. As the manual states, it's "recommended for severe duty usage", and I don't consider anything I do with my truck to be "severe duty".
I run 91 or 93 when towing. I see lower knock values and the engine will hold timing better. Mileage sucks either way so i don't care about that but i need all the power i can get and knock is not good so avoiding it when i have a huge load on the engine is good. it's not friendly on the wallet at all, 87 is at $3.15 a gallon so im guessing 93 is probably close to 3.70-3.80 a gallon and 91 should be close to $3.50.
There is no question that using Premium adds quite a bit of HP/TQ. Just look at 5Star's dyno chart posted on their web page for 15-16 3.5L Ecoboosts, specifically the Pink and Green lines.
Im so confused now lol I was always under the assumption that it made no real difference between reg or premium but that chart is looking pretty promising. 30hp gain at the wheels is beyond impressive.
Im so confused now lol I was always under the assumption that it made no real difference between reg or premium but that chart is looking pretty promising. 30hp gain at the wheels is beyond impressive.
Keeping in mind this is 87 vs 93 octane, not vs 91 (which is most places 'premium'). On a high-compression, turbo engine that changes mapping based on the knock sensors it makes sense.
There is no question that using Premium adds quite a bit of HP/TQ. Just look at 5Star's dyno chart posted on their web page for 15-16 3.5L Ecoboosts, specifically the Pink and Green lines.
Interesting, I been looking for stock Dyno for 3.5TT in my Tremor for comparison. I have recently switched to Premium (last 3 tanks) and can 100% tell the difference. A couple of observations
1.5+mpg
Drivability - much better in the midrange, noticeable power increase, drive over a 2% grade bridge every day and it takes less boost in the top approach, the engine feels better overall like you would expect. Is it worth it? .55+ for 93 here..............In most climates I would say probably not but in Florida at least half the year yes.
Yesterday i was driving home and the outside temp was reading 94 in town and bout 92 on the interstate. Just common logic that the engine would run much better on prem in that heat than 40+50 degreess in the north most of the year.
There is no question that using Premium adds quite a bit of HP/TQ. Just look at 5Star's dyno chart posted on their web page for 15-16 3.5L Ecoboosts
But those are NOT stock tunes, are they? At least they don't look like they are. To make that statement, we'd need a STOCK 3.5EB run on the same dyno with both regular and premium. My guess is it'd be significantly less than what that chart shows. I used premium on my truck and didn't feel any difference with regular driving, so doubt it was anywhere close to 30HP.
06-24-2018, 10:54 PM
