I have a 07 Supercrew with 6500 miles on it. Currently I get between 11.5 and 12.5 MPG in city day-to-day driving. Is there actually a break-in period where I should begin to get better fuel economy. Some people say the fuel economy will get better when the truck is broke-in. I am sceptical and don't really believe my mileage will ever increase without mods. Does anyone have experience with increased economy after a break-in period.

 

Well, my 07 supercrew only has 1,200 miles on it, and I am only getting around 11 MPG in daily city driving. I sure hope that there is a break-in period.

 

The brake-in period is the first 500 miles. You baby the motor, and then I was told to change oil. If you want the motor to last more than 100k this is a must. Ask any engine builder. With 6500 on it you are long past the break-in period. I have never heard of mpg increasing on a truck with age. I have heard of it going down over time.

Sad, when I get better mileage in my Hummer H2. (im sure someone will bash me over this comment.)

 

11.5mpg, dude you need to go easy on the gas. Your foot is the culprit. I doubt you will see any increased fuel economy. Use your RPM when you drive your truck, you will Definitely see an improvement if you do. I don't think there is a break in period for our trucks.

 

There is no traditional "break-in " for these newer motors. They come ready to go. You don't need to drive a few miles and change the oil. The manual even states, just go to you first oil change. However, they do tend to improve slightly in gas mileage over the first 8,000 to 10,000 miles as they adapt to your driving style. Maybe 10% at most. If you are getting 11 to 12, that is about the nornm if you have a 4x4, but if a 4x2, that is well short of what most get. I get 17 around the metroplex and 19 on the highway.

 

I have about 7k on my '07 SCrew 5.4, and have seen 16 since the day I took it home. Only time it got better was on the road for 6hrs and I saw just shy of 20. I dont horse it, and drive so it shifts before 2500 rpm's. Usually around 2000. I definetly notice when I am repsonding to a fire call that the mileage drops severly.

 

I think my problem is with my driving. I've got a 4x2 with the 5.4L and I never get more than 11-12 MPG each tank of gas. I've been driving pretty heavy on the peddle though since I got the truck 6 weeks ago. I think it's because I went from a 98 with the 4.6L to what I have now, and I'm really enjoying speeding around town with the extra horsepower (a little too much I guess). I'll start paying more attention to my RPM's.

 

yeah, take it easy for a few tanks and see how that turns out


11-12 is horrible--i get over 12 towing my jeep in the mountains with OD off

 

I have a 2007 F-150 super cab 6.5 box 5.4, Auto 17” wheels and 3.55 gears. It has 2500 miles on it. I just filled up and got 16.1 out of this tank. All city driving. I don't drive real fast but I do jump on it from time to time but most of the time I drive pretty conservatively. If I babied it I might get 18 but babying it is no fun!

 

I tend to get about 12-13 city and 14-16 highway with my truck. May improve though once I get around to getting new plugs and COP's. I know it sure is due for them with 95k miles on the truck. I get 12 when pulling my 17ft camper with OD off. And it is an old heavy 70's model at that.

 

Ive been getting 15-16 in the city since day one with my FX4. It has no mods yet either. Ease up on the pedal!

 

No. There is no break-in period for mainly stoplight-to-stoplight driving.

The cure is an occasional run on the highway to straighten that out.

I'll tell you how bad mainly short run driving is...a lady that works at my chruch drives her ~2000ish LeSabre about two blocks and back, nothing more. She was getting 13 MPGs, if that.

After I mentioned that she take it out on a highway jaunt, she told me she average a good bit over 20 MPGs doing that. I think she ran to Katy and back, about 100 miles for her, with the grandkids for a day at the mall...problem solved.

Getting out of 2nd gear is good on occasion.

 

I get around 20 mpg on the highway with my V6, but if all I do is short in-city trips it gets as low as 13.

 

My mileage improved in the first 10K or so. Now I have 110K and get 17 highway doing 80. Not bad for a big ole 4 door truck.
I am sure it would be better at 65 but who cares.

 

I must be the only guy to have ever read the manual. The break-in period for the engine is stated as being 1,000 miles. It also states you will get a more accurate reading of fuel economy after 2,000 - 3,000 miles. (look in the back of the book, Fuel...calculating fuel economy. Page 338 in the 2007 F-150 manual).

I buy a new truck almost every year. By 1500 miles, fuel economy is as good as it's gonna get. Almost all mod's are tailored to increase power (if they do anything at all), and that spells increased fuel consumption. I wouldn't waste a dime on any engine mod.

The only way to get better mileage is by driving style. I'm getting about 14 MPG city in my FX4. Got to ease up on that gas pedal and quit trying to hang with the rice burners from light to light. On the highway, I draft other cars. At times I achieve 19-20 MPG even with a 500lb load in the bed.