Snaggletooth

Jesus. I'm happy to get 12. I average 11.

TheBigKahuna

Started swapping my plugs today. ran into an issue getting #4 out. But I think I found my misfire cause. Plug #3, the anode was bent so that the gap was about twice as big as it should be. no idea how that happened, but just swapping out 4 of the plugs, the low RPM shudder in OD/4th is almost gone. I can still make it jerk once, but not repeatedly. Unfortunately had to put it all back together after only swapping 4 plugs. Waiting for it to cool so I can get the others now.

I really hope these plugs have 100,000+ on them, and replacing them gets me 1-2mpg. I just don't think 13.5 is normal. My 4.7L Tundra got 16mpg all the way to 175,000 miles, and also felt a LOT more powerful than this 5.4L. I know it's apples to oranges. but just think 13mpg is too low.

JJJELLO

Before using Sea Foam on my gas tank I averaged about 14 mpg round town at 5400ft elevation.
Engine in my 95 F-150XLT with 91000miles and a 302 V-8, 5.0 with a K&N air intake system was sluggish and had no attitude even with staight pipe and lots of TLC.
After sea foam entered my front gas tank with 10 gal in it, a whole different story. Drove it 150 miles from Prescott to Flagstaff to Grand Canyon and engine sputtered coughed then was reborn into a flareside truck with attitude. What a difference the sea foam made. MPG on fill up at home was a whopping 20 mpg. Far cry from the 14mpg last week. Put it in gas tank not in vacuum like off power booster (dangerous even for certified technician).
Starts better in morning and holds idle steady and once warmed up is ready to tackle any hill around. Just have to give engine time to connect with my hot-rod-mama gas pedal pressure. LOL
Thanks for the good advice in these forums.

wolfpack219

Over 350 miles now on my 2016 3.5 eco 4X4 3.55 gears. I'm getting 18.5 mpg around town with quite a bit of elevation changes and stop and go. Just staying out of those turbod really helps the efficiency of the mpg. My buddy just told me his 2015 Tundra is sucking at 12.5 mpg around town. What a difference. I'm happy with the mileage.

lovemyboost

Does anyone know why the smaller EB gets worse EPA mileage that the 3.7? I don't think the EPA ride gets them into the boost?

3.7

just a guess: there needs to be a balance between engine size and how hard it has to work. perhaps the smaller one is just working that much harder.

lovemyboost

I thought of that. But doesn't it take the same amount of energy and isn't that identical on the EPA test?

uh60mip

You would think that energy requirements being the same, the smaller engine would do better. The facts are, however, that even with the same requirement for torque to move the same vehicle, the 2.7 must go into the Turbo mode (no pun intended) earlier than the 3.5 to produce a given amount of energy required to move the vehicle. Once the vehicle is up to speed, though, then the smaller engine will perform better maintaining speed, providing one is on level terrain or going downhill. As a comparison, my 5.0 V8 gets better overall mileage than a co-worker's 3.5 EB. Max power on his is better under throttle, but I get an average of 1.5 - 2 MPG better than he does under similar conditions. Basically, and this is just my opinion, if you run empty most of the time, either EB will be adequate. If you're going to carry a load, internal or towed, a reasonable amount of time stick with a V8. Hope this helps a bit.

lovemyboost

I think that makes good sense. So it stands to reason that something else is going on. How about this?: I have owned the Coyote and EB. I think vehicles are being built to win the EPA testing award and to pass the mandated standards. It also makes sense the our government is run by fools in that the EPA test has nothing to do with how people drive.

In any case, With my driving, I noticed very little difference in mileage with either engine except on the freeway. The Coyote won that hands down. The V8 works most efficiently and will be my next truck.

Here is my analysis and there is a lot of support from Wards and others:

5.0 Best overall
3.7 Excellent too as long as you don't tow.
3.5 EB Great engine and good for some heavy towing.
2.7 EB Great for ? I don't know for the EPA test? Not for me.
Diesel If your going to tow heavy and often.

Ford is making great trucks. I wish they would quit pushing EB, which doesn't make sense to me, but...

TheBigKahuna

Changed my original plugs recently, at over 100k miles! Guessing plugs were original, looked like it. On two of them the anodes were bent well beyond spec gap. So my low rpm shuddering in OD went away. But my average mpgs dropped from 13.5 to 12.7 for last two fillups. Same driving, haven't been pulling the boat, etc. Hmmm?