EcoBoostJake

I would disagree with this statement, although I could also be guilty of the same effect.


I changed out my plugs around 80k and immediately noticed a jump in MPG by around 2-3 miles per gallon highway. I also felt like the truck had more power, however may or may not have been the case. But I couldn't argue with the instant increase in mpg while driving the same paths, in the same manner. Sadly I did not check the gap on the existing plugs, but all of the new ones I set at .030 - .032.


I will need to set aside time to do the front/rear diff. I got the truck with 75k, but now am at 105k and do not know if they were done before I got it. It could be the factory fluid still grinding away in there.....

redrob820

I am having pretty bad mpg myself (2014 screw 3.7 V6) ever since I got the truck.I'm averaging 15 hwy and 9 city. I haven't hand calculated but from reading posts the avg. mpg is "close" to accurate. I haven't done any maintenence since I purchased it 4k miles ago. I'm now at 31k, going to change engine oil, plugs and air filter and hope for the best.

LEBScrew13

I'd like to say air filter too but the one I previously had in only had 5k miles on it and still looked new. I changed it out because I have a few trips planned with lots of dusty dirt roads. This is the 4th filter I have put in the truck since I've owned. I really think the spark plugs made the biggest difference.

I think the truck appears to feel smoother but hard to say.

How do they clarify "severe duty" it would be interesting to read up on that. I do a fair amount of towing and long distant towing. It's not a super heavy trailer but around 6500lbs. I've put 3000 miles on that trailer in less than a year.

Panther150

Same engine, I'm getting 19 mpg with 35k miles on it. Only had routine oil changes. I'm running stock tires and wheels. What's your commute like?

RogueGT

I do know that right after I wash my truck it is soooo much faster. The drag coefficient drops like a rock from all the dust specs gone from my paint!! Oh but wait...add a coat of wax, it fills in all the pin scratches in the clear coat and then the truck screams as the drag coefficient seems non-existent!!! Any more and I'd be able to tip the scale and convert the truck to a pure energy state and achieve warp status.

redrob820

Lol, that's good stuff. There's always one huh.

redrob820

Zero commute, I got a company car. I put a 4 inch rc lift and 295/70 18 so my mpg is about the same as my V10 excursion now. The mpg I was getting was prior to the lift and wheels.

waterboyjlw

I expected more from a Nuke....no Langmuir's Theory of lubrication or thin film flow discussion???? Thanks for the chuckle.

zx12-iowa

Well the biggest diff was the plugs. It's an ecoboost and your plug gap was like 1/3 off lol

Rte66

Now you have me worried too.
My (recently purchased) 2011 3.5L ECB Lariat 4X4 has 75K miles and I don't have any previous records. I'm told it has fresh oil, but now I'm wondering if the front or rear diff needs changing. I'm also having a tough time getting over 13 MPG. Do I need to pull the plugs? I intend to get a lot of mileage out of this truck and I want to do the right thing.