My son has an 05 Supercrew that is only getting around 13 miles to the gallon. This seems low to me, I know the truck as had new plugs air filter etc, but has not seemed to help. No CML, runs good, Stock tires etc, just poor milage. Any ideas?

Thanks

 

Do a search; There was just a recent thread last week about this and I know I have seen it come up before. Basically every one is saying is has to do with the seasonal blend and the amount of Ethonol that is being put into the gas. It really drops your mileage quite a bit. The main way to get some of it back is to get a programmer and get a custom tune with an economy mode. Talk to Mike at 5 Star Tuning, He will take care of you.
http://http://www.5startuning.com/testimonials.html

 

Lets try this again Testimonials | 5 Star Tuning | Custom Dynomemeter Chassis Tuning Products and Services

 

The mileage sounds about right. I have an '06 SCrew 4wd 5.4L with a 3.73LS with a 275/60/20 tire. Right now I'm getting about 12 city, 16 highway on the winter blend. This is about 2mpg less than the summer blend.

 

I use the premium unleaded and it burns alot slower than before!

 

It has been stated and covered many times before that premium is not needed in these trucks.
So my question to you is: Do you notice the same % increase in mileage as compared to the % you are having to spend on premium as compared to regular.

Right now in my area premium costs about 15-20% more than regular, so I would have to see a pretty decent jump in mileage (almost 2mpg) to even justify the cost of stepping up. Anything less in mileage just isn't worth the cost.

 

I have an 05 screw 4x4 5.4 with 3.73ls I was getting right at 14.2 average mostly city , but the last week or so it's dropped to 13.4 but the last time it did this i had a coil going out so I'm guessing I have another one doing it , but like MC Davis said it's about right .

 

Seems low to me. I have a 5.4 Heavy Duty 8200lbs truck, so quite a few hundred pounds heavier with the 4.10 rear end and 4X4. Last week I did a 500 mile round trip towing a 2500lbs enclosed trailer with the aerodynamics of a barn. In the trailer I had a Model-A Ford half the way, so another 2500lbs. The entire journey was hilly terrain, blizzard conditions sometimes using 4x4 for traction on the snow. 80% freeway. I averaged 12.5 mpg with 95 octane winter fuel (5% Ethanol). So your son must be hauling some!
Ed

 

A few things to note:
- Your octane is higher than ours, MUCH higher as most pumps here in the States don't exceed 93
- Your blend is 5% less than ours. Most areas are 10% if not 15% ethanol.
- If you're 80% freeway then you should be doing better than most anyway. I'm 80% city getting 13.83 mpg over 20 fill ups (nearly 4,900 miles). I'm also not that easy on my truck.

 

E10 is coming in Feb '11 but E5 will still be available indefinitely.

 

Prior to getting new plugs, new belt, cam phaser complete install and a 2'' level kit I am getting worse gas mileage. I was getting 14, now Im lucky to get 13. I attribute most of this to the quality of fuel as I have noticed some differences. I assume its only going to get worse when I get tires, so I'm enjoying it now!

 

I just went from a 04 Excursion gas V10 to an 05 F150 5.4L, 4 in. lift, and running 35"s. Dont know the exact mileage yet but is upwards of 14mpg and I drive about 80% city. Im very happy. Drive a gas excursion for a while and you will never complain about the F150 mileage again.

 

When the truck is empty, 13mpg is what my wife gets when she drives. I can push 14mpg since I don't drive as 'aggressively' as she does.... She complains like I drive like a grampa!

With that said, I'm squeezing about the same 13-14mpg out of my 6.4 diesel. Guess which truck I prefer driving :-)

Couple of things to check--
- your tire pressures. Tire pressure drops about 1psi per 10F ambient drop. All of mine were down 5-6psi as soon as Fall came around.
- don't haul around anything unnecessarily. I drive around town without my 100lb spare tire. Small risk to take, and probably not much mpg gain, but there is some minor acceleration improvement.

 

Do you happen to know how the mileage was in the summer?

I typically see a 2-3 mpg drop when the winter gas is in the system, including loss of mileage for cold morning warm-ups. I have 3.55 LS and a fiberglass topper that really help out my mileage though.

 

i believe the answer is right in front of you. how old is the kid?

i know that when i was younger my right foot weighed a LOT more. i would trade a good burnout, or light to light race with buddies for a few mpg's any day. mileage was the least of my concerns. i am willing to bet tht no matter what you change on the truck, the mpg's will still be low.