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TLDR: higher octane doesn't improve mpg nor does it automatically add power.
I am not so sure. My 2021 Tremor ecoboost I bought used with 35,000 miles had always been ran with 87 and showed 15.4 mpg lifetime...using the "normal" mode exclusivly. I ran three tanks of gas covering about 1400 miles of mixed driving in normal after a reset and was averaging almost 16. Ran the next 5 tanks with 93 octane and my daily driving averages jumped up to 18.4. and sat near 20 for a few tanks. No change in driving habit or extra time spent on the highway. Truck to and from work each day exactly the same. It also felt much more responsive compared to the lower octane gas.
I've learned over the years that if you're paying attention to fuel mileage as you drive you will improve it. Changing fuel types has never made a real difference for me and that includes high alcohol content fuels. The computers in modern vehicles react so quickly to adjust for driving conditions. I haven't really heard an explanation on what that "flex fuel" badge on many vehicles means but I assume it's meant to encourage oxygenated fuels. But IMHO, if you buy high horsepower trucks and use it at all, there is no sense in worrying about fuel mileage. You can't have both.
I am not so sure. My 2021 Tremor ecoboost I bought used with 35,000 miles had always been ran with 87 and showed 15.4 mpg lifetime...using the "normal" mode exclusivly. I ran three tanks of gas covering about 1400 miles of mixed driving in normal after a reset and was averaging almost 16. Ran the next 5 tanks with 93 octane and my daily driving averages jumped up to 18.4. and sat near 20 for a few tanks. No change in driving habit or extra time spent on the highway. Truck to and from work each day exactly the same. It also felt much more responsive compared to the lower octane gas.
That's an interesting observation. Any idea why with the higher octane = you got less mileage?
I recently did a very short test.
Again the reliable 302 V8 wirh 280,000km on the clock.(174,000m) FX4
on a relatively flat 20km highway stretch starting computer while already at 95kmh on cruise so no adding in consumption of acceleration and got 10.5 L/100 (approx 59mph -22+mpg) with no head wind
return trip hours later slightly faster @ 100km h (62) with noticeable headwind this time, 11.2 L/!00- 21mpg
To reduce consumption I also do mild starts from lights and do a lot of coasting, The truck can roll quite nicely for a good distance so you save on gas and brake wear with gentler stops.
Seems it can be quite a pig if you step on it though..
Still don't see any advantage though of ethanol in terms of -alleged- reduction of emissions
Anybody comparing mileage runing flex fuel E85 vs regular gas (E5-15)?
Sooo.. I am making a massive thread dedicated to MPG... Tips on getting the best bang for the buck. I ask if you have anytips post them up. Or any links... I will keep this thread update... And will delete the BS.
Post 21 and 22... Otto's post very informative, be sure to check it!!!
TLDR: higher octane doesn't improve mpg nor does it automatically add power. Octane is a measure of resistance to ignition of the fuel. Higher octane allows higher compression. Modding for MPG is kind of pointless.*
Tried the deal with keeping the RPMS under 2000 and it was a bust. Actually lost about 1 mpg (13.5>12.5) My truck does best when staying under about 2300. Never figured this out but I finally read somewhere that when you keep RPMs so low that it keep the tranny in the lower gear for a really long time causing more resistance or something to that effect. Stop light to stop light it 2000 RPMs is probably good. Think it really makes sense on the highway to use a higher RPM when accelerating. Instead of taking a half mile to get to 70 just gas it a little more get to speed and let overdrive and cruise do their job.
Guess what I'm trying to say is don't take anything as gospel and play around with these ideas. Some people driving conditions and needs are different so what works for one may not work for all.
Did just do the gotts mod. Haven't been able to check mileage yet (no money to do consecutive fill-ups at the moment. I hate the holidays) but I feel it has improved. Gas gauge just seems to move a little slower. We'll see.
soft higher RPM is not the same as gasing it higher RPM . Soft higher RPM is utilizing momentum
Hey guys, couldn't be happier with my F150 for mileage.
2024 XLT w/ 3.5 Ecoboost, 3.55 rear end, 4WD.
75% highway, 25% city, lifetime MPG is 21.3, and that's after I calibrated it via the engineering menu. +/- .1 MPG every fill up compared to hand calc.
65 mph approximately 24 MPG flat highway
70 mph approximately 23 MPG
75 MPG approximately 21-22 MPG
I turn off Auto Start/Stop when I remember to.
Gonna level it and put on 34s, but NOT load rated (E) tires, plan is Nitto G3s 275/65r20. I expect a half an MPG drop once tire size is updated in forscan and I calibrate after a few fill ups.
Hey guys, couldn't be happier with my F150 for mileage.
2024 XLT w/ 3.5 Ecoboost, 3.55 rear end, 4WD.
75% highway, 25% city, lifetime MPG is 21.3, and that's after I calibrated it via the engineering menu. +/- .1 MPG every fill up compared to hand calc.
65 mph approximately 24 MPG flat highway
70 mph approximately 23 MPG
75 MPG approximately 21-22 MPG
I turn off Auto Start/Stop when I remember to.
Gonna level it and put on 34s, but NOT load rated (E) tires, plan is Nitto G3s 275/65r20. I expect a half an MPG drop once tire size is updated in forscan and I calibrate after a few fill ups.
What is the engineering menu? how do you calibrate it?
Just calculated my mpg on my old 95... She has 409,916.9 miles on her, original engine and transmission. On my front tank, I am getting 15.44mpg. Most of that is highway driving to and from work going 70~80 mph on the interstate. The fuel pump on the front tank is original to the truck. The pump for the rear tank has been replaced twice but I haven't measured the mpg for it yet.
