mjbenedict

Yet you probably missed that you were most-likely accelerating more with the 3.5 as well. Quote from link here "wind resistance rises much more steeply between 70 and 80 mph than it does between 50 and 60"

Link: http://www.mpgforspeed.com Note: their research is for the average car, our trucks will always be much less wind resistant than the "average car".

I had a Hemi (known for bad mileage) now the ecoboost. If I drive as conservatively as you state for your 5.0 I get similar gains out of the ecoboost. It's hard because that feeling pushing you back in the seat is addicting.
Same with the Hemi, similar gains with conservative driving.
So, yes, moot, unless you misstated your driving habit change.

mjbenedict

Again, the Ecoboost acceleration is addicting. I can get 19 MPG conservatively out of 4X4 screw w/city driving. Heavy driving a 6cyl sitting at a light with no boost will get better mileage than a 8cyl.

tetvet68

I agree with "learning to drive the 3.5". My '11 Scab, FX4, 3.73s, 6.5 foot box will usually get near 16 mpg in the city and 20-22 mpg on the highway. That's IF I keep my right foot under control, IF there is not much wind on the nose and IF I stay at 70 mph or under on the highway. The computer learns how you drive and I suspect if you drive it hard, it learns you want to have a lot of power available all of the time so tends to burn more gas. The reverse is probably true if you drive for economy. The dealer re-flashed the computer recently for the 'stumbling issue" and I tend to drive conservatively and I ended up with a bad lag in throttle response. The Tech said the computer was learning to drive for economy. So I did the throttle recalibration (learned it here) and it responds much better now. Also had the truck weighed and is 6100 lbs with the topper and tools so is quite heavy. it was stumbling a little on hills so we put new plugs gapped at .030 in (30,000 miles) and it's running great again. Gap in the old plugs was out to .045 from original .035 and there was a fair amount of carbon on them. I think a person needs to blow it out once in a while if you don't do a lot of highway driving. Still really like the truck and motor. It's very strong.

Fabman

I have a super charged mustang and it pulls right off the bottom, it doesn't need much throttle angle to get you going. Of course it's lighter, but I drive it way harder. It makes 670 RWHP on e85 @20 psi and gets better mileage than my short bed/short cab Tremor and they both have 4:10's. I guess it's just a turbo thing I have to learn to live with....it does pull my big trailer like a champ though....

acdii

You cant compare a car with low COD to a heavy truck with the COD of a brick. Its much lighter so doesnt take near as much to get to speed, and once there doesnt take much to keep it there. There is also the fact the engine in a Mustang is designed to move the car quickly where the engine in a truck is designed to put lots of torwue to the ground to pull a heavy load, two different engine designs, and it doesnt matter if it has 4, 6, 8 or 10 cylinders.

The Ecoboost develops torque at 1500 and stays there all the way to redline, where the V8 has to get up to 3000 RPM or more to hit its peak torque. Also keep in mind gearing in the transmission are not even close to each other. Mustang again is designed to get it moving quickly, where the truck is designed to pull a lot of weight.

So if you want to see just how well your SC Mustang really is compared to the truck, load it up so it weighs the same as the truck, and then see how well it does. Bet it will drink a lot more fuel to do what it does now empty.

On mine, I loaded a 5* 91 perf/tow, and the MPG hasn't changed, but the trans is shifting so much better. It gits up and goes really nice now too, no more doubling down to pass a car, just a bit of go pedal and its moving. What a difference, only down side, I can still feel a bit of stutter under power up a hill when in 6th at 60 MPH. Regapped the plugs to 30, but didnt help, I'm thinking it has a weak coil pack, but no way to prove it. I like that I can get a squeak out of the rear in third when I put it down.

Love this truck! Love the Ecoboost! Love the 21 MPG!

j76475

I just completed a 4500 mile road trip from Ft Worth Tx to Portland Oregon via Reno Nevada. My 2012 averaged the entire trip at 19.3 mpg. I relied on the onboard trip computer. I have a 336 gallon tank and use only regular gas. Pulling a small trailer and a John Deere XUV 550 Gator. Traveled all of the roads with high mountain passes. I-70 in UTAH and us Hwy 50 across Nevada. Across Mt Lassen in California. Never had a problem and loved ever bit of the trip except for California and Oregon gas prices all over $3.00 per gallon. and slow speeds for towing vehicles. Did not have to worry about hills. Eco boost made short work of hills. Had to wait for sslow cars.

acdii

I did a similar trip in 2012 with the 12 Screw 4x4 EB and averaged about 21 MPG highway, no trailer, had a tonneu on the back too. Going through Denver in the mountains it never needed to downshift, set the cruise, sit back and relax.

g8rrick

Drove from western North Carolina to Tucson Arizona and return. Total of 4595 miles. My 2015 F-150 Eco-Boost 3.5L Screw cab Platinum 3.73, max tow package. Averaged about 65 mph and the mileage computer said I averaged 9.2 mpg and that includes many miles unhitched. My 2004 5.4L did this well but had a 3.15 rear end. It tows like a breeze and the integrated brake controller is amazing. We hit a lot of windy places and the anti-sway brakes you down. Loved the ride, the trailer hitch finder, checklist etal. However, if you think this is an economical engine it is not. I kept the boost gauge lit up on the display and if I had kept the boost to zero, I would still be driving back from AZ. Again, love my truck, but there is no serious mpg benefit from this engine.

Sirikenewtron

There was only one reason I bought the ecoboost, test drove it, felt that torque, made my decision

Sirikenewtron

I've really enjoy my ecoboost, with that being said it's been in for warranty work going on two time within the last couple of months and most likely the truck that replaces it will be the 5.0 or the 6.7 F250.